Thanks a lot Brian it worked. removed kubuntu-backports and oibaf /graphics-drivers ppa using the ppa-purge then update issue was fixed and now upgraded to 18.04. Thanks again for your valuable time.
** Attachment removed: "CurrentDmesg.txt.txt" https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1787383/+attachment/5176270/+files/CurrentDmesg.txt.txt ** Attachment removed: "Dependencies.txt" https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1787383/+attachment/5176271/+files/Dependencies.txt ** Attachment removed: "VarLogDistupgradeLspcitxt.txt" https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1787383/+attachment/5176276/+files/VarLogDistupgradeLspcitxt.txt ** Attachment removed: "ProcCpuinfoMinimal.txt" https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1787383/+attachment/5176272/+files/ProcCpuinfoMinimal.txt ** Attachment removed: "ProcEnviron.txt" https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1787383/+attachment/5176273/+files/ProcEnviron.txt ** Attachment removed: "VarLogDistupgradeAptclonesystemstate.tar.gz" https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1787383/+attachment/5176274/+files/VarLogDistupgradeAptclonesystemstate.tar.gz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1787383 Title: Cant update Kubuntu 16.04 to 18.04 update crashes displaying "could not calculate the update" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1787383/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
