Do this - no, don't do it...
The offending PPA is
download.opensuse.org. Unless Jerry tells you not to, I would open
Menu --> System --> Install/Remove Software. You'll be asked to enter your root (administrative) password. Click on the
Settings tab and select
Repositories. Then find the
Other Software tab and uncheck the box next to
http://download.opensuse.org. Your computer will update normally.