Comment 14 for bug 1005593

If you get stuck in the catch 22 of no internet without proxy and no proxy without internet and no updates because no internet.....

Download this file to a USB memory

http://packages.ubuntu.com/precise/gnome/gnome-control-center
see bottom of page --depending on 32 or 64 bit

You may also need the gnome-control-center-data which is linked to on
the same page

If you have dependency issues look for links on that page Mint 13 is
ubuntu 12.04

be careful for 64 or 32 bit