如何在ubuntu14.04

我想学习LLVM所以我在我的Ubuntu 14.04安装铛铛安装，但我遇到一些problems.Here是：如何在ubuntu14.04

当我执行命令：sudo apt-get install clang-3.5我只是得到喜欢跟随一些错误消息：

Reading package lists... Done Building dependency tree  Reading 
state information... Done Some packages could not be installed. This 
may mean that you have requested an impossible situation or if you are 
using the unstable distribution that some required packages have not 
yet been created or been moved out of Incoming. The following 
information may help to resolve the situation: 
The following packages have unmet dependencies: clang-3.5 : Depends: 
libclang1-3.5 (= 1:3.5~svn201651-1ubuntu1) but it is not going to be 
installed 
Depends: libobjc-4.8-dev but it is not going to be installed E: Unable to correct problems, you have held broken 
packages.

，然后我尝试安装libclang1-3.5，所以我执行命令：

sudo apt-get install libclang1-3.5

，然后我得到了另一条错误消息像以前一样：

Reading package lists... Done Building dependency tree  Reading 
state information... Done Some packages could not be installed. This 
may mean that you have requested an impossible situation or if you are 
using the unstable distribution that some required packages have not 
yet been created or been moved out of Incoming. The following 
information may help to resolve the situation: 
The following packages have unmet dependencies: libclang1-3.5 : 
Depends: libobjc-4.8-dev but it is not going to be installed E: Unable 
to correct problems, you have held broken packages.

然后我执行命令：

sudo apt-get install libobjc-4.8-dev

这个时候得到错误信息：

The following packages have unmet dependencies: libobjc-4.8-dev : 
Depends: gcc-4.8-base (= 4.8.2-19ubuntu1) but 4.8.4-2ubuntu1~14.04.1 
is to be installed 
Depends: libgcc-4.8-dev (= 4.8.2-19ubuntu1) but 4.8.4-2ubuntu1~14.04.1 is to be installed 
Depends: libobjc4 (>= 4.8.2-19ubuntu1) but it is not going to be installed E: Unable to correct problems, you have held 
broken packages.

后

sudo apt-get install gcc-4.8-dev 再次得到一些错误信息

Reading package lists... Done 
Building dependency tree  
Reading state information... Done 

The following packages have unmet dependencies: 
lib32gcc-4.8-dev : Depends: gcc-4.8-base (= 4.8.2-19ubuntu1) but 4.8.4-2ubuntu1~14.04.1 is to be installed 
        Depends: lib32gomp1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: libx32gomp1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: lib32itm1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: libx32itm1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: lib32atomic1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: libx32atomic1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: lib32asan0 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: libx32asan0 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: lib32quadmath0 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: libx32quadmath0 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
libx32gcc-4.8-dev : Depends: gcc-4.8-base (= 4.8.2-19ubuntu1) but 4.8.4-2ubuntu1~14.04.1 is to be installed 
        Depends: lib32gomp1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: libx32gomp1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: lib32itm1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: libx32itm1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: lib32atomic1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: libx32atomic1 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: lib32asan0 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: libx32asan0 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: lib32quadmath0 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
        Depends: libx32quadmath0 (>= 4.8.2-19ubuntu1) but it is not going to be installed 
E: Unable to correct problems, you have held broken packages.

什么我现在应该做什么？

============================================== 执行命令后sudo apt-get purge gcc *我得到了跟踪消息，似乎遇到了一些错误。

[email protected]:/$ sudo apt-get purge gcc* 
Reading package lists... Done 
Building dependency tree  
Reading state information... Done 
Note, selecting 'gcc-4.8-aarch64-linux-gnu' for regex 'gcc*' 
Note, selecting 'libx32gcc-4.7-dev' for regex 'gcc*' 
Note, selecting 'libghc-gconf-dev' for regex 'gcc*' 
Note, selecting 'gcompris-sound-pa' for regex 'gcc*' 
Note, selecting 'libghc-libtagc-prof' for regex 'gcc*' 
Note, selecting 'libgcc1-dbg-armel-cross' for regex 'gcc*' 
Note, selecting 'gcj-4.8-jdk-aarch64-linux-gnu' for regex 'gcc*' 
Note, selecting 'libhfgcc1-armel-dcv1' for regex 'gcc*' 
Note, selecting 'gcj-4.8-aarch64-linux-gnu' for regex 'gcc*' 
Note, selecting 'gcompris-sound-pt' for regex 'gcc*' 
Note, selecting 'gccgo-4.7' for regex 'gcc*' 
Note, selecting 'gccgo-4.8' for regex 'gcc*' 
Note, selecting 'gccgo-4.9' for regex 'gcc*' 
Note, selecting 'gcj-aarch64-linux-gnu' for regex 'gcc*' 
Note, selecting 'logcentral' for regex 'gcc*' 
Note, selecting 'libgcc1-dbg-powerpc-cross' for regex 'gcc*' 
Note, selecting 'gconf2' for regex 'gcc*' 
Note, selecting 'gcc-4.4-locales' for regex 'gcc*' 
Note, selecting 'gcompris-sound-ru' for regex 'gcc*' 
Note, selecting 'gcc-4.4-powerpc-linux-gnu' for regex 'gcc*' 
Note, selecting 'lib32gcc-4.7-dev' for regex 'gcc*' 
Note, selecting 'guile-gnome2-gconf' for regex 'gcc*' 
Note, selecting 'gcovr' for regex 'gcc*' 
Note, selecting 'gcal-common' for regex 'gcc*' 
Note, selecting 'pulseaudio-module-gconf' for regex 'gcc*' 
Note, selecting 'gcc-4.8-base' for regex 'gcc*' 
Note, selecting 'java-gcj-compat' for regex 'gcc*' 
Note, selecting 'gcompris-sound-sk' for regex 'gcc*' 
Note, selecting 'gcompris-sound-sl' for regex 'gcc*' 
Note, selecting 'libgcr-3-doc' for regex 'gcc*' 
Note, selecting 'gcj-jre-headless' for regex 'gcc*' 
Note, selecting 'gcompris-sound-so' for regex 'gcc*' 
Note, selecting 'gcc-4.8-plugin-dev' for regex 'gcc*' 
Note, selecting 'gcompris-sound-sr' for regex 'gcc*' 
Note, selecting 'gcompris-sound-sv' for regex 'gcc*' 
Note, selecting 'libghc-svgcairo-dev-0.12.1-becda' for regex 'gcc*' 
Note, selecting 'libgcrypt-doc' for regex 'gcc*' 
Note, selecting 'libtagc0-ruby' for regex 'gcc*' 
Note, selecting 'gccgo-4.9-doc' for regex 'gcc*' 
Note, selecting 'gcompris-sound-th' for regex 'gcc*' 
Note, selecting 'libgcc1-armel-cross' for regex 'gcc*' 
Note, selecting 'gcompris-sound-tr' for regex 'gcc*' 
Note, selecting 'gcc-4.8-aarch64-linux-gnu-base' for regex 'gcc*' 
Note, selecting 'gcc-aarch64-linux-gnu' for regex 'gcc*' 
Note, selecting 'kjumpingcube' for regex 'gcc*' 
Note, selecting 'eclipse-rcp-gcj' for regex 'gcc*' 
Note, selecting 'tagcoll' for regex 'gcc*' 
Note, selecting 'gcc-4.8-source' for regex 'gcc*' 
Note, selecting 'java-gcj-compat-headless' for regex 'gcc*' 
Note, selecting 'gcompris' for regex 'gcc*' 
Note, selecting 'libgconfmm-2.6-doc' for regex 'gcc*' 
Note, selecting 'gcompris-sound-ur' for regex 'gcc*' 
Note, selecting 'gcc-4.7-arm-linux-gnueabihf' for regex 'gcc*' 
Note, selecting 'icedtea-gcjwebplugin' for regex 'gcc*' 
Note, selecting 'gcc-4.4-arm-linux-gnueabihf' for regex 'gcc*' 
Note, selecting 'gcc-mingw-w64-bootstrap' for regex 'gcc*' 
Note, selecting 'gcc-4.8-multilib' for regex 'gcc*' 
Note, selecting 'libtagc0-dev' for regex 'gcc*' 
Note, selecting 'gconf-service-backend' for regex 'gcc*' 
Note, selecting 'logcheck-database' for regex 'gcc*' 
Note, selecting 'libgcc1-dbg-arm64-cross' for regex 'gcc*' 
Note, selecting 'gcc-4.8-powerpc64le-linux-gnu-base' for regex 'gcc*' 
Note, selecting 'lib32gcc1' for regex 'gcc*' 
Note, selecting 'libhtml-tagcloud-perl' for regex 'gcc*' 
Note, selecting 'gccgo' for regex 'gcc*' 
Note, selecting 'gconf2-common' for regex 'gcc*' 
Note, selecting 'python-pygccxml' for regex 'gcc*' 
Note, selecting 'gcc-snapshot' for regex 'gcc*' 
Note, selecting 'gcc-4.8-powerpc-linux-gnu-base' for regex 'gcc*' 
Note, selecting 'gcc-4.6-multilib' for regex 'gcc*' 
Note, selecting 'libsigc++-2.0-dev' for regex 'gcc*' 
Note, selecting 'gcc-4.7-base' for regex 'gcc*' 
Note, selecting 'libgc-dev' for regex 'gcc*' 
Note, selecting 'libgconf2.0-cil-dev' for regex 'gcc*' 
Note, selecting 'pulseaudio-module-gconf-dbg' for regex 'gcc*' 
Note, selecting 'libgcc1-armhf-dcv1' for regex 'gcc*' 
Note, selecting 'libx32gcc-4.8-dev' for regex 'gcc*' 
Note, selecting 'libvomsjapi-java-gcj' for regex 'gcc*' 
Note, selecting 'gcc-avr' for regex 'gcc*' 
Note, selecting 'gcompris-data' for regex 'gcc*' 
Note, selecting 'libghc-gconf-dev-0.12.1.1-4d3b6' for regex 'gcc*' 
Note, selecting 'gcc-4.4-multilib' for regex 'gcc*' 
Note, selecting 'libghc-svgcairo-prof' for regex 'gcc*' 
Note, selecting 'gcc-4.6-doc' for regex 'gcc*' 
Note, selecting 'libghc-gconf-doc' for regex 'gcc*' 
Note, selecting 'gccgo-powerpc-linux-gnu' for regex 'gcc*' 
Note, selecting 'libsac-java-gcj' for regex 'gcc*' 
Note, selecting 'fcitx-libs-gclient' for regex 'gcc*' 
Note, selecting 'gcj-4.8-jdk-powerpc64le-linux-gnu' for regex 'gcc*' 
Note, selecting 'libgnome2-gconf-perl' for regex 'gcc*' 
Note, selecting 'gcal' for regex 'gcc*' 
Note, selecting 'gcap' for regex 'gcc*' 
Note, selecting 'libgcc1-arm64-cross' for regex 'gcc*' 
Note, selecting 'libsigc++-1.1-dev' for regex 'gcc*' 
Note, selecting 'gcj-jdk' for regex 'gcc*' 
Note, selecting 'gcj-arm-linux-gnueabihf' for regex 'gcc*' 
Note, selecting 'lib32gcc-4.8-dev' for regex 'gcc*' 
Note, selecting 'colorgcc' for regex 'gcc*' 
Note, selecting 'sagcad-doc' for regex 'gcc*' 
Note, selecting 'libghc-svgcairo-dev' for regex 'gcc*' 
Note, selecting 'lib64gcc1-powerpc-cross' for regex 'gcc*' 
Note, selecting 'compizconfig-backend-gconf' for regex 'gcc*' 
Note, selecting 'libgc1c2' for regex 'gcc*' 
Note, selecting 'libgc1c3' for regex 'gcc*' 
Note, selecting 'libgcc-4.8-dev-ppc64el-cross' for regex 'gcc*' 
Note, selecting 'gcin-qt4-immodule' for regex 'gcc*' 
Note, selecting 'gcompris-sound-ptbr' for regex 'gcc*' 
Note, selecting 'gcc-4.6-base' for regex 'gcc*' 
Note, selecting 'gcfilms' for regex 'gcc*' 
Note, selecting 'libsigc++-2.0-0' for regex 'gcc*' 
Note, selecting 'gccgo-4.8-arm-linux-gnueabihf' for regex 'gcc*' 
Note, selecting 'git-remote-gcrypt' for regex 'gcc*' 
Note, selecting 'gcc-arm-linux-gnueabi' for regex 'gcc*' 
Note, selecting 'gcdw' for regex 'gcc*' 
Note, selecting 'gcc-arm-none-eabi' for regex 'gcc*' 
Note, selecting 'libgcc1-powerpc-cross' for regex 'gcc*' 
Note, selecting 'libxmlsec1-gcrypt' for regex 'gcc*' 
Note, selecting 'libqtgconf-dev' for regex 'gcc*' 
Note, selecting 'libgcc1-armel-dcv1' for regex 'gcc*' 
Note, selecting 'libhfgcc1-dbg-armel-cross' for regex 'gcc*' 
Note, selecting 'gcc-4.5-arm-linux-gnueabi' for regex 'gcc*' 
Note, selecting 'gcj-4.8-jdk' for regex 'gcc*' 
Note, selecting 'libgcu-dbg' for regex 'gcc*' 
Note, selecting 'libsfgcc1-armhf-dcv1' for regex 'gcc*' 
Note, selecting 'gcc-opt' for regex 'gcc*' 
Note, selecting 'xgc' for regex 'gcc*' 
Note, selecting 'libsaxon-java-gcj' for regex 'gcc*' 
Note, selecting 'gcc-4.6-source' for regex 'gcc*' 
Note, selecting 'libgcc1-dbg' for regex 'gcc*' 
Note, selecting 'python-argcomplete' for regex 'gcc*' 
Note, selecting 'libsigc++-1.9-0' for regex 'gcc*' 
Note, selecting 'gcc-4.7-arm-linux-gnueabihf-base' for regex 'gcc*' 
Note, selecting 'libextutils-pkgconfig-perl' for regex 'gcc*' 
Note, selecting 'gccgo-arm-linux-gnueabihf' for regex 'gcc*' 
Note, selecting 'gcc-4.7-arm-linux-gnueabi' for regex 'gcc*' 
Note, selecting 'libghc-libtagc-prof-0.12.0-7e84b' for regex 'gcc*' 
Note, selecting 'gcstar' for regex 'gcc*' 
Note, selecting 'fcitx-table-bingchan' for regex 'gcc*' 
Note, selecting 'gccgo-multilib' for regex 'gcc*' 
Note, selecting 'libgconf2-dev' for regex 'gcc*' 
Note, selecting 'pngcrush' for regex 'gcc*' 
Note, selecting 'lib64gcc1-dbg-powerpc-cross' for regex 'gcc*' 
Note, selecting 'gccgo-4.8-powerpc-linux-gnu' for regex 'gcc*' 
Note, selecting 'libsigc++-2.0-doc' for regex 'gcc*' 
Note, selecting 'libgcc1' for regex 'gcc*' 
Note, selecting 'libgcc-4.7-dev-armhf-cross' for regex 'gcc*' 
Note, selecting 'gcc-mingw-w64-base' for regex 'gcc*' 
Note, selecting 'gcc-4.7-doc' for regex 'gcc*' 
Note, selecting 'gcc-docs' for regex 'gcc*' 
Note, selecting 'libsigc++-2.0-0c2a' for regex 'gcc*' 
Note, selecting 'gcin' for regex 'gcc*' 
Note, selecting 'libtagc0-ruby1.8' for regex 'gcc*' 
Note, selecting 'llvm-gcc' for regex 'gcc*' 
Note, selecting 'libgctp-dev' for regex 'gcc*' 
Note, selecting 'pngcheck' for regex 'gcc*' 
Note, selecting 'nagcon' for regex 'gcc*' 
Note, selecting 'libgctp0d' for regex 'gcc*' 
Note, selecting 'gcc-multilib' for regex 'gcc*' 
Note, selecting 'r-cran-mgcv' for regex 'gcc*' 
Note, selecting 'lib64gcc1-powerpc-dcv1' for regex 'gcc*' 
Note, selecting 'gccgo-4.8-multilib' for regex 'gcc*' 
Note, selecting 'libsigc++-2.0-0c2' for regex 'gcc*' 
Note, selecting 'libdesktop-agnostic-cfg-gconf' for regex 'gcc*' 
Note, selecting 'gcin-tables' for regex 'gcc*' 
Note, selecting 'libgcj14-dev' for regex 'gcc*' 
Note, selecting 'gcompris-sound-fi' for regex 'gcc*' 
Note, selecting 'libswt3.2-gtk-gcj' for regex 'gcc*' 
Note, selecting 'gccgo-doc' for regex 'gcc*' 
Note, selecting 'gcompris-sound-fr' for regex 'gcc*' 
Note, selecting 'gcc-4.8-multilib-arm-linux-gnueabihf' for regex 'gcc*' 
Note, selecting 'libghc-gconf-prof-0.12.1.1-4d3b6' for regex 'gcc*' 
Note, selecting 'eclipse-jdt-gcj' for regex 'gcc*' 
Note, selecting 'gcj-powerpc-linux-gnu' for regex 'gcc*' 
Note, selecting 'gcalcli' for regex 'gcc*' 
Note, selecting 'gcompris-sound-gd' for regex 'gcc*' 
Note, selecting 'ggcov' for regex 'gcc*' 
Note, selecting 'gcj-4.4' for regex 'gcc*' 
Note, selecting 'gcj-4.8' for regex 'gcc*' 
Note, selecting 'libgcc1-ppc64el-cross' for regex 'gcc*' 
Note, selecting 'libxerces2-java-gcj' for regex 'gcc*' 
Note, selecting 'ant-optional-gcj' for regex 'gcc*' 
Note, selecting 'gcj-4.4-base' for regex 'gcc*' 
Note, selecting 'libgcr-dev' for regex 'gcc*' 
Note, selecting 'gcompris-sound-he' for regex 'gcc*' 
Note, selecting 'gcompris-sound-hi' for regex 'gcc*' 
Note, selecting 'gcc-4.4-doc' for regex 'gcc*' 
Note, selecting 'gir1.2-gck-1' for regex 'gcc*' 
Note, selecting 'gcc-4.8-locales' for regex 'gcc*' 
Note, selecting 'gcompris-sound-hu' for regex 'gcc*' 
Note, selecting 'libsigc++-1.2-5c102' for regex 'gcc*' 
Note, selecting 'gcc-mingw-w64-i686' for regex 'gcc*' 
Note, selecting 'gcu-plugin' for regex 'gcc*' 
Note, selecting 'gccgo-4.9-multilib' for regex 'gcc*' 
Note, selecting 'gcc-4.7-multilib-arm-linux-gnueabi' for regex 'gcc*' 
Note, selecting 'gcompris-sound-id' for regex 'gcc*' 
Note, selecting 'gcj-4.8-jre-lib' for regex 'gcc*' 
Note, selecting 'logcheck' for regex 'gcc*' 
Note, selecting 'libgconf-bridge-dev' for regex 'gcc*' 
Note, selecting 'gccgo-4.7-arm-linux-gnueabi' for regex 'gcc*' 
Note, selecting 'gcompris-sound-it' for regex 'gcc*' 
Note, selecting 'libgcr-3-dev' for regex 'gcc*' 
Note, selecting 'gcin-chewing' for regex 'gcc*' 
Note, selecting 'libgcrypt-dev' for regex 'gcc*' 
Note, selecting 'gcc-powerpc-linux-gnu' for regex 'gcc*' 
Note, selecting 'gcj-4.8-jre-headless' for regex 'gcc*' 
Note, selecting 'gcin-data' for regex 'gcc*' 
Note, selecting 'gcc-4.8-arm-linux-gnueabihf' for regex 'gcc*' 
Note, selecting 'eclipse-platform-gcj' for regex 'gcc*' 
Note, selecting 'gccgo-4.7-multilib' for regex 'gcc*' 
Note, selecting 'gcolor2' for regex 'gcc*' 
Note, selecting 'gcc-4.5-arm-linux-gnueabihf' for regex 'gcc*' 
Note, selecting 'gccgo-4.8-aarch64-linux-gnu' for regex 'gcc*' 
Note, selecting 'gconf' for regex 'gcc*' 
Note, selecting 'gcc-powerpc64le-linux-gnu' for regex 'gcc*' 
Note, selecting 'gcc-4.5-powerpc-linux-gnu' for regex 'gcc*' 
Note, selecting 'gcc-4.7-arm-linux-gnueabi-base' for regex 'gcc*' 
Note, selecting 'gcc-4.8-arm-linux-gnueabihf-base' for regex 'gcc*' 
Note, selecting 'libgcal0' for regex 'gcc*' 
Note, selecting 'gcj-powerpc64le-linux-gnu' for regex 'gcc*' 
Note, selecting 'libgcr-base-3-1' for regex 'gcc*' 
Note, selecting 'gccgo-4.8-doc' for regex 'gcc*' 
Note, selecting 'libghc-uuagc-cabal-doc' for regex 'gcc*' 
Note, selecting 'gceph' for regex 'gcc*' 
Note, selecting 'libgconfmm-2.6-dev' for regex 'gcc*' 
Note, selecting 'gcin-gtk3-immodule' for regex 'gcc*' 
Note, selecting 'gcc-m68hc1x' for regex 'gcc*' 
Note, selecting 'libgcc-4.8-dev-armhf-cross' for regex 'gcc*' 
Note, selecting 'libghc-svgcairo-prof-0.12.1-becda' for regex 'gcc*' 
Note, selecting 'gir1.0-gconf-2.0' for regex 'gcc*' 
Note, selecting 'gcompris-sound-lt' for regex 'gcc*' 
Note, selecting 'gcrystal' for regex 'gcc*' 
Note, selecting 'libxml-commons-resolver1.1-java-gcj' for regex 'gcc*' 
Note, selecting 'eclipse-pde-gcj' for regex 'gcc*' 
Note, selecting 'libsfgcc1-dbg-armhf-cross' for regex 'gcc*' 
Note, selecting 'libgconfmm-2.6-1c2' for regex 'gcc*' 
Note, selecting 'libghc-uuagc-cabal-dev-1.0.4.0-b5c8b' for regex 'gcc*' 
Note, selecting 'logcentral-tools' for regex 'gcc*' 
Note, selecting 'gcc-4.6-locales' for regex 'gcc*' 
Note, selecting 'gccgo-4.8-powerpc64le-linux-gnu' for regex 'gcc*' 
Note, selecting 'gcompris-sound-mr' for regex 'gcc*' 
Note, selecting 'libgcrypt11-doc' for regex 'gcc*' 
Note, selecting 'gcl-doc' for regex 'gcc*' 
Note, selecting 'gcc-4.8-multilib-powerpc-linux-gnu' for regex 'gcc*' 
Note, selecting 'libgcrypt11' for regex 'gcc*' 
Note, selecting 'gcompris-sound-nb' for regex 'gcc*' 
Note, selecting 'libtagc0' for regex 'gcc*' 
Note, selecting 'gcompris-sound-ast' for regex 'gcc*' 
Note, selecting 'libghc-gconf-prof' for regex 'gcc*' 
Note, selecting 'gcompris-sound-nl' for regex 'gcc*' 
Note, selecting 'libgcr-3-common' for regex 'gcc*' 
Note, selecting 'gcompris-sound-nn' for regex 'gcc*' 
Note, selecting 'gcc-4.9-base' for regex 'gcc*' 
Note, selecting 'libgcj11' for regex 'gcc*' 
Note, selecting 'ecj-bootstrap-gcj' for regex 'gcc*' 
Note, selecting 'librepository-java-gcj' for regex 'gcc*' 
Note, selecting 'libgcj14' for regex 'gcc*' 
Note, selecting 'libgcr-ui-3-1' for regex 'gcc*' 
Note, selecting 'gccgo-go' for regex 'gcc*' 
Note, selecting 'libsfgcc-4.7-dev-armhf-cross' for regex 'gcc*' 
Note, selecting 'libgck-1-doc' for regex 'gcc*' 
Package 'libjaxp1.3-java-gcj' is not installed, so not removed 
Package 'libsaxon-java-gcj' is not installed, so not removed 
Package 'libsigc++-2.0-dev' is not installed, so not removed 
Package 'libsigc++-2.0-doc' is not installed, so not removed 
Package 'libtagc0' is not installed, so not removed 
Package 'libtagc0-dev' is not installed, so not removed 
Package 'libtagcoll2-dev' is not installed, so not removed 
Package 'libx32gcc-4.7-dev' is not installed, so not removed 
Package 'libx32gcc-4.8-dev' is not installed, so not removed 
Package 'libx32gcc1' is not installed, so not removed 
Package 'libx32gcc1-dbg' is not installed, so not removed 
Package 'libxerces2-java-gcj' is not installed, so not removed 
Package 'libxml-commons-resolver1.1-java-gcj' is not installed, so not removed 
Package 'logcheck' is not installed, so not removed 
Package 'logcheck-database' is not installed, so not removed 
Package 'pulseaudio-module-gconf' is not installed, so not removed 
Package 'pulseaudio-module-gconf-dbg' is not installed, so not removed 
Package 'colorgcc' is not installed, so not removed 
Package 'compizconfig-backend-gconf' is not installed, so not removed 
Package 'docbook-xsl-saxon-gcj' is not installed, so not removed 
Package 'fcitx-libs-gclient' is not installed, so not removed 
Package 'fcitx-table-bingchan' is not installed, so not removed 
Package 'gcal' is not installed, so not removed 
Package 'gcal-common' is not installed, so not removed 
Package 'gcalcli' is not installed, so not removed 
WARNING: The following essential packages will be removed. 
This should NOT be done unless you know exactly what you are doing! 
    apt libapt-pkg4.12 (due to apt) libc6 (due to apt) libgcc1 (due to apt) libstdc++6 (due to apt) gnupg (due to apt) base-files base-passwd libdebconfclient0 (due to base-passwd) bash debianutils (due to 
    bash) dash (due to bash) libtinfo5 (due to bash) bsdutils coreutils libacl1 (due to coreutils) libattr1 (due to coreutils) libselinux1 (due to coreutils) dpkg (due to dash) diffutils libbz2-1.0 (due to 
    dpkg) liblzma5 (due to dpkg) zlib1g (due to dpkg) tar (due to dpkg) e2fsprogs e2fslibs (due to e2fsprogs) libblkid1 (due to e2fsprogs) libcomerr2 (due to e2fsprogs) libss2 (due to e2fsprogs) libuuid1 
    (due to e2fsprogs) util-linux (due to e2fsprogs) findutils grep install-info (due to grep) libpcre3 (due to grep) gzip hostname libc-bin libcap2 (due to libc-bin) login libpam0g (due to login) 
    libpam-runtime (due to login) libpam-modules (due to login) mount libmount1 (due to mount) ncurses-bin perl-base sed tzdata (due to util-linux) debconf (due to util-linux) sysv-rc (due to util-linux) 
    libncurses5 (due to util-linux) libslang2 (due to util-linux) 
0 upgraded, 0 newly installed, 1636 to remove and 0 not upgraded. 
After this operation, 3,222 MB disk space will be freed. 
You are about to do something potentially harmful. 
To continue type in the phrase 'Yes, do as I say!' 
?] yes 
Abort.

来源

2017-07-29 Alpha OF

你可以访问https://askubuntu.com。这个网站只针对编程问题 –

试试下面的命令来修复损坏的软件包：

sudo apt-get update 
sudo apt upgrade 
dpkg --get-selections | grep hold 
sudo apt-get autoremove

看看它是否工作。

编辑：你可以尝试这些命令太

sudo apt-get autoclean 
apt-get clear cache

编辑＃2：

用文本编辑器，编辑您的/etc/apt/sources.list文件，以便它具有以下内容：

#------------------------------------------------------------------------------# 
#       OFFICIAL UBUNTU REPOS        # 
#------------------------------------------------------------------------------# 


###### Ubuntu Main Repos 
deb http://us.archive.ubuntu.com/ubuntu/ trusty main universe 
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty main universe 

###### Ubuntu Update Repos 
deb http://us.archive.ubuntu.com/ubuntu/ trusty-security main universe 
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main universe 
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-security main universe 
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates main universe 

###### Ubuntu Partner Repo 
deb-src http://archive.canonical.com/ubuntu trusty partner 

###### Ubuntu Extras Repo 
deb http://extras.ubuntu.com/ubuntu trusty main 
deb-src http://extras.ubuntu.com/ubuntu trusty main 

###### For LLVM 
deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main 
deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main

（注：这是一件好事修改它之前创建的sources.list的备份）

之后，运行这篇文章顶部的所有命令（sudo apt-get update ... sudo apt uprgrade ... etc ..等等..）。然后运行命令来下载llvm。希望它有效。

来源

2017-07-29 17:26:31 travisjayday

这似乎不适用于我，执行'apt-get clear cache'时出现错误信息：无效操作清除 –

@AlphaOF其中命令成功了吗？另外，你有没有添加一个自定义的PPA？ – travisjayday

我使用的是windows，我的Ubuntu是一个在VMWare上运行的虚拟机，我用它并不是那么多，我不记得我在虚拟机上做了什么。我运行它的时间是4-5个月前。顺便说一下，命令“appitude”也不起作用。 –

如何在ubuntu14.04

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