While trying to upgrade from the most recent Karmic server installation to Lucid today, I also encountered this error.
I was able to work around this issue by first installing 'libplymouth2' from Lucid and then re-running 'do-release-upgrade'. == Error Message == SystemError: E:Couldn't configure pre-depend libplymouth2 for mountall, probably a dependency cycle. == Package Dependencies == The package dependencies and pre-deps for 'mountall' and 'libplymouth2' are included below. Package: mountall Priority: required Depends: makedev, udev, coreutils (>= 7.1) Pre-Depends: libc6 (>= 2.9), libdbus-1-3 (>= 1.2.16), libnih-dbus1 (>= 1.0.0), libnih1 (>= 1.0.0), libplymouth2 (>= 0.8.0~-10ubuntu1), libudev0 (>= 147) Package: libplymouth2 Priority: required Depends: libc6 (>= 2.8), libpng12-0 (>= 1.2.13-4) -- Upgrade fails while upgrading to Ubuntu 10.04 from Ubuntu 9.10 server https://bugs.launchpad.net/bugs/533020 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
