So, it is primary a problem with dpkg. Could you check if tar is installed on your system?
Could you reinstall tar and try the distribution upgade again? May be that solve your problem. Could you give a kern/system log that shows the seqfault. Is dpkg involved? ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete ** Summary changed: - Upgrade i386 12.10 to 13.04 fails segfaulting in libc 2.17 breaking system + Upgrade i386 12.10 to 13.04 fails segfaulting in libc 2.17 breaking system - dpkg affected -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1183682 Title: Upgrade i386 12.10 to 13.04 fails segfaulting in libc 2.17 breaking system - dpkg affected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1183682/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs