I installed Linux Mint Lisa on my netbook. Unfortunately, when using the Mate desktop the system did not suspend on lid closure. The recommended solution for this problem seemed to be upgrading Mate to the newest version.
Now, I can generally follow written directions pretty good, but something went horribly wrong when I tried to add the repository for the latest Mate desktop. In the process of trying to undo the damage, I seem to have messed up my software sources/repository settings.
How do I fix this?
On a positive note, the netbook still works.