According to comment #11 the source of the problem have changed. It's caused by a bad behavior from the installation process of apt-build. It is (correctly in my case) creating a amd-64 folder tree in the /var/cache. But it wrongly puts a i386-line in sources.list. Those to MUST be identical.
** Package changed: update-manager (Ubuntu) => apt-build (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1268120 Title: apt-build generates en error message in update-manager To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt-build/+bug/1268120/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
