initially there was a plasma crash and all of menu, wallpaper, panel were not displayed.
crash report was with #kcmshell4 akonadi -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1450271 Title: Plasma crashes in Kubuntu 15.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kwin/+bug/1450271/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs