Just to make sure that this is not a configuration problem please make sure that you have actually set the preference to check for updates daily.
I think It is in System->Administration->Software Properties or Syanptic Package Manager. I don't remember exactly. I have never faced such problem. -- update-notifier doesn't check repositories https://launchpad.net/bugs/50348 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
