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我试图安装php5.6卷曲包。它之前安装过，但是我做了一些手动构建卷曲的东西，所以我从系统中删除了php5.6-curl包。此操作后，我也运行autoremove。无法在ubuntu 16.10上再次安装php5.6-curl。 ppa被添加。
所以，在成功构建东西之后，我试图调用apt-get install php5.6-curl，它向我展示了这一点。
[email protected]:~$ sudo apt-get install php5.6-curl
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package php5.6-curl is not available, but is referred to by another
package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'php5.6-curl' has no installation candidate
你可以肯定的是PPA：的Ondrej/php5-5.6是在我的Ubuntu的安装为php5.6是存在于系统和php5.6卷曲包之前就已isntalled。
我也尝试再次添加ppa并运行apt-get更新。林不知道这个消息是什么意思。
http://ppa.launchpad.net/ondrej/php/ubuntu yakkety InRelease
.....
Fetched 107 kB in 3s (31.9 kB/s)
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/shutter/ppa/ubuntu yakkety Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: https://repo.skype.com/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1F3045A5DF7587C3
W: The repository 'https://repo.skype.com/deb stable InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: https://linuxdesktopcloud.mail.ru/screenshoter/deb/dists/appind/InRelease: Signature by key 8A99BA500079839DF7DE4833196205AF7396FF77 uses weak digest algorithm (SHA1)
E: Failed to fetch http://ppa.launchpad.net/shutter/ppa/ubuntu/dists/yakkety/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
接下来我尝试的是使用apt-cache search php5.6检查php扩展。没有php5.6卷曲，但我知道它应该在那里。
[email protected]:~$ apt-cache search php5.6
php-igbinary - igbinary PHP serializer
php-msgpack - PHP extension for interfacing with MessagePack
php-ssh2 - Bindings for the libssh2 library
php-xdebug - Xdebug Module for PHP
php5.6-opcache - Zend OpCache module for PHP
php5.6-mysql - MySQL module for PHP
php5.6-json - JSON module for PHP
php5.6-common - documentation, examples and common module for PHP
php5.6 - server-side, HTML-embedded scripting language (metapackage)
php5.6-mcrypt - libmcrypt module for PHP
php5.6-readline - readline module for PHP
php5.6-gd - GD module for PHP
php5.6-xml - DOM, SimpleXML, WDDX, XML, and XSL module for PHP
php5.6-cli - command-line interpreter for the PHP scripting language
php5.6-mbstring - MBSTRING module for PHP
php5.6-ldap - LDAP module for PHP
libapache2-mod-php5.6 - server-side, HTML-embedded scripting language (Apache 2 module)
php-memcached - memcached extension module for PHP, uses libmemcached
我也在云中启动了干净的ubuntu 16.04并试图做同样的动作。 - 安装php5.6，php5.6-curl。 - 删除卷曲，然后手动构建它 - 再次安装php5.6-curl
所有的工作都像一个魅力。当我在云ubuntu上执行apt-cache search php5.6时，扩展名列表太大了。
我不知道我在做什么错，我没有真正强大的Linux家伙，所以我不知道发生了什么事情。请帮忙。