I'm using Kubuntu 13.04 64-bit (and 32-bit on another system, same prob). I've not had any updates become available for over two months now (since 1/24/14). I know it's theoretically possible there have been no updates since then, but I find it odd, given that there are usually multiple security or bug-fix updates every week. So something's probably corrupted in the apt-get system.
Does anyone know of a way to rebuild all apt-get related lists, etc? Here's what I've tried so far, without success:
disabling any non-ubuntu repo's
rm -r /var/cache/apt/*.bin && apt-get update
rm -vf /var/lib/apt/lists/* && apt-get update
Any help would be greatly appreciated.