I rolled back the amd64-microcode to the previous version (3.20180524.1~ubuntu0.14.04.1 to 2.20131007.1+really20130710.1) and it resolved the issue, I can now boot to 151, so it is definitely related to amd64-microcode. I am using AMD Phenom(tm) II X4 975 Processor
** Package changed: xorg (Ubuntu) => amd64-microcode (Ubuntu) ** Summary changed: - cyclic reboot with latest kernels possibly related to the cpu microcode updater + cyclic reboot caused by the amd microcode updater -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1779092 Title: cyclic reboot caused by the amd microcode updater To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/amd64-microcode/+bug/1779092/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
