1、问题描述
OS: kali
自上一次执行
sudo apt-get upgrade
之后，系统任务栏中一直有待升级提醒，而再执行
sudo apt-get upgrade
却是如下提示
Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: mitmproxy python-netlib python-openssl 0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
任务栏右上角图示：
2、解决方法
$ sudo apt-get -u dist-upgrade
3、析
有部份packages的安装版比release版新而出现”The following packages have been kept back”这个问题，使用2中的解决方法 统一更新到发布的版本。
这条命令会强制更新软件包到最新版本，并自动解决缺少的依赖包。
The following packages have been kept back [Solved]
原文：http://www.cnblogs.com/aqing1987/p/4194988.html