如何恢复Oracle JDK更新？

几个月前，我已经停止为我的KUbuntu 14.04接收Oracle JDK的更新。我照着http://www.webupd8.org/2012/09/install-oracle-java-8-in-ubuntu-via-ppa.html 它的工作装和以前配置的，但现在更新过程中我只看到错误：如何恢复Oracle JDK更新？

Err https://ppa.launchpad.net trusty/main amd64 Packages 
    gnutls_handshake() warning: The server name sent was not recognized 
Err https://ppa.launchpad.net trusty/main i386 Packages 
    gnutls_handshake() warning: The server name sent was not recognized 
W: Failed to fetch https://ppa.launchpad.net/webupd8team/java/ubuntu/dists/trusty/main/binary-amd64/Packages gnutls_handshake() warning: The server name sent was not recognized 

W: Failed to fetch https://ppa.launchpad.net/webupd8team/java/ubuntu/dists/trusty/main/binary-i386/Packages gnutls_handshake() warning: The server name sent was not recognized 

E: Some index files failed to download. They have been ignored, or old ones used instead.

我当前安装的Java版本为1.8.0_91。的/etc/apt/sources.list.d/webupd8team-java-trusty.list

内容：

deb https://ppa.launchpad.net/webupd8team/java/ubuntu trusty main

请帮我解决这个错误。

来源

2016-06-17 Charon

我解决了问题。从我的系统

删除回购：

rm /etc/apt/sources.list.d/webupd8team-java-trusty.list*

重新添加回购：

sudo add-apt-repository ppa:webupd8team/java

来源

2016-09-20 18:00:44 Charon

如何恢复Oracle JDK更新？

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