If you are seeing Ubuntu GPG Error BADSIG use the one of the following methods to fix
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There is a very simple command that reinstalls all the distribution packages and reconfigures them automatically. This is particularly helpful when you have done a partial upgrade and eventually have broken the system dependencies tree.
If you’re running out of disk space and you want to quickly see what packages are using the most space on your hard drive, use the following command
If you want to keep a specific package at a specific version on your machine you can try this tutorial.This is very useful if you want to lock specific version of kernel,drivers,application versions
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This addon allows installing ubuntu packages from iceweasel, firefox, galeon or konqueror just clicking on a web link. For this to work, links need to have an url beginning with apt:// This package does not install the packages or download them from the web sites, it just launches apt, passing the package name to install as a parameter to apt.
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