Gjig – Gnome jig – is a useful gui command that lets you access apt, apt-cache, dpkg and more. It is a front-end that allows cleaning up of old files, removing, purging, upgrading and so on. In order to install it, you need to type in at the terminal,
sudo aptitude install wajig
as wajig is the command line body of the software. Gjig is included when you do this install.
Now, to run the command, you type Alt F2 again, and enter the line
gksudo instead of regular sudo because the command is for a GUI. The results look like this:
As you can see, this gives you access to many commands you can run without having to remember all the syntax.
Have a great weekend!
Update (June 23, 2013): The last Ubuntu man page for gjig is in Lucid Lynx. Wajig still exists, but I have not been able to find a GUI.