I have this issue as well, and I'm pretty sure this is a regression of the latest released intel-microcode package as I deliberately upgrade this single one just today.
** Attachment added: "Content of /proc/cpuinfo" https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1759920/+attachment/5095607/+files/_proc_cpuinfo.content -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1759920 Title: intel-microcode 3.20180312.0 causes locks up at login screen(w/ linux- image-4.13.0-37-generic) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1759920/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
