Hmm, after further investigation, I do believe it is a proxy-related problem (see Bug #24250), not directly connected to apt-cacher.
In fact, if I use a syntax like the following for all the entries in /etc/apt/sources.list: deb http://hostname:3142/it.archive.ubuntu.com/ubuntu/ feisty main where 'hostname' is the name of the apt-cacher server, the upgrade to gutsy starts and the channels are correctly updated to gutsy, like in the following: deb http://hostname:3142/it.archive.ubuntu.com/ubuntu/ gutsy main This does not fix the issue but, at least, it is a workaround to perform the upgrade using apt-cacher. -- When apt-cacher is used, Update-Manger fails (not #78673 duplicate) https://bugs.launchpad.net/bugs/113658 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
