In my case I get it when upgrading to trusty... I presume because precise is no longer supported. Removing the Apt preference/directive «APT::Default-Release "precise";» e.g. in /etc/apt/apt.conf.d/ helps.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1168518 Title: "The value 'precise' is invalid for APT::Default-Release" when upgrading from precise to quantal via command line To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1168518/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
