答案1
我建议清理您的软件包并通过终端运行更新。首先:
sudo apt-get clean
然后我有一个很棒的代码给你——我已经运行了 6 年了,从 12.04 开始,现在(仍然)是 16.04 LTS,我对它非常满意:
sudo apt-get -y update; sudo apt-get -y upgrade; sudo apt-get -y autoremove
解释:
-y: says "yes" to the question "are you shure you want..."
update: prepares the system packages upgrade
upgrade: does the packages update (no deleting or installing of new packages)
autoremove: removes packages what are no longer needed
; : compared to && it will do the following command even the first command would not execute completely
答案2
额外和过期的通知消息是漏洞。此问题已在开发中修复,Ubuntu 16.04 的更新将很快发布,大概是本月晚些时候(2016 年 6 月)。
尝试运行sudo apt update && sudo apt dist-upgrade
。