Thank you Po-Hsu Lin for the additional information.
RESULTS of ´nopti´ TEST ACTION: 1) GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nopti" 2) grub has been updated RESTART Boot does not stop (after seven dots have turned from white to red) Startup is completed . Test is performed on both Ubuntu and Xubuntu distributions. All are x86 systems. Preliminary outcome. Page Table Isolation instructions make the system crash during boot How to proceed from here ? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1839381 Title: Regression after Kernel updates: Failed Boots with LUKS on LVM To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1839381/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs