If you use apt-cacher and want to run "do-release-upgrade" then make sure that the apt-cacher option "ubuntu_release_names" contains the new release code name you want to upgrade to.
I wanted to update Ubuntu via console from 15.04 "vivid" to 15.10 "wily" and got the following errors on console: Checking for a new Ubuntu release Err Upgrade tool signature 403 Sorry, not allowed to fetch that type of file: wily.tar.gz.gpg Err Upgrade tool 403 Sorry, not allowed to fetch that type of file: wily.tar.gz Fetched 0 B in 0s (0 B/s) WARNING:root:file 'wily.tar.gz.gpg' missing Failed to fetch Fetching the upgrade failed. There may be a network problem. To fix this problem I created a new config file (/etc/apt- cacher/conf.d/99ubuntu) from the default configuration (/etc/apt-cacher /apt-cacher.conf), edited it to uncomment the line and added all missing code names from http://releases.ubuntu.com/ grep '^#*ubuntu_release_names' /etc/apt-cacher/apt-cacher.conf >/etc/apt-cacher/conf.d/99ubuntu nano /etc/apt-cacher/conf.d/99ubuntu Then "do-release-upgrade" worked with apt-cacher. Maybe this can be same in your case . Kind regards Maddes -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1533375 Title: error during attempt to upgrade tofrom 14.04.3 to 14.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1533375/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
