[ubuntu-za] Software updates

[Jan Greeff]

The update manager for Ubuntu 12.04 is warning abut untrusted packages 
as follows:

linux-generic-pae linux-headers-3.2.0-54 
linux-headers-3.2.0-54-generic-pae linux-headers-generic-pae 
linux-image-3.2.0-54-generic-pae linux-image-generic-pae linux-libc-dev

I have tried to delete some independent software sources from the update 
manager but the warning keeps appearing. Can somebody please point me in 
the right direction here?

Jan