I'm having this right now. The workarounds/fixes don't help. After installing kubuntu 15.04 beta from dvd all was good until I did apt-get upgrade and installed some new stuff yesterday Apr 13th (I guess).
Attached apt's history which shows packages before and after. ** Attachment added: "apt history log" https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1431332/+attachment/4375244/+files/apthistory.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1431332 Title: sddm not starting after upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1431332/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs