the problem is the residual configuration of the virtualbox provided by oracle rc virtualbox-4.2 4.2.16-86992~Ubuntu~precise amd64 Oracle VM VirtualBox
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1692200 Title: do-release-upgrade from 14.04 failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1692200/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
