Unknown GPG signatures

[Anthony Richardella <richarde uiuc edu>]

Should I worry about packages I download using up2date that 
give an "unknown GPG signature" error? After installing Test 
2 and running up2date there's about 20 packages that give 
this error.

There are also other files like initscripts-7.49-1. After 
installing it, it still stays that the installed version is 
7.48-1. 

Anthony