My workaround was to remove .kde & restart kde virtually from scratch. :-( but kept a backup :-)
This am I download QT pkgs (4.8.3+dfsg-0ubuntu3.2~ubuntu12.10~ppa1) and tried with old .kde folder. The crash backtrace is enclosed ** Attachment added: "plasma-desktop-20130221-085845.kcrash" https://bugs.launchpad.net/kubuntu-ppa/+bug/1117365/+attachment/3539779/+files/plasma-desktop-20130221-085845.kcrash -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to Kubuntu PPA. https://bugs.launchpad.net/bugs/1117365 Title: plasma-desktop 4.10 crashes immediately on login To manage notifications about this bug go to: https://bugs.launchpad.net/kubuntu-ppa/+bug/1117365/+subscriptions -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs