Both broken repositories - the main canonical one and the local Swiss one - seem to work again, but only after I selected one of them over System -> Systemverwaltung -> Software-Quellen. Maybe it had something to do with me always manually editing the file /etc/apt/sources.list. BUT, I have always done this and it always worked before. In addition, comparing the "generated" sources.list with my manually edited sources.list shows no difference whatsoever. Very strange!! Just for completeness here the sources.list generated by my "Software-Quellen":
deb http://ch.archive.ubuntu.com/ubuntu/ intrepid main restricted universe multiverse deb-src http://ch.archive.ubuntu.com/ubuntu/ intrepid main restricted universe multiverse deb http://ch.archive.ubuntu.com/ubuntu/ intrepid-updates main restricted universe multiverse deb-src http://ch.archive.ubuntu.com/ubuntu/ intrepid-updates main restricted universe multiverse deb http://ch.archive.ubuntu.com/ubuntu/ intrepid-backports main restricted universe multiverse deb-src http://ch.archive.ubuntu.com/ubuntu/ intrepid-backports main restricted universe multiverse deb http://ch.archive.ubuntu.com/ubuntu/ intrepid-security main restricted universe multiverse deb-src http://ch.archive.ubuntu.com/ubuntu/ intrepid-security main restricted universe multiverse deb http://ch.archive.ubuntu.com/ubuntu/ intrepid-proposed restricted main multiverse universe deb-src http://ch.archive.ubuntu.com/ubuntu/ intrepid-proposed restricted main multiverse universe -- Intrepid repositories not available https://bugs.launchpad.net/bugs/260012 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs