Please upgrade using the recommended process, which will change the existing apt sources.list lines rather than adding new ones -- it is indeed the fact you were attempting to use packages from multiple releases that caused this.
** Changed in: upstart (Ubuntu) Status: Incomplete => Invalid -- apt-get dist-upgrade want to replace upstart with sysvinit https://bugs.launchpad.net/bugs/160297 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs