Grub changed?

[renehoj]

You need to add the smt=on line after smt=off.

The update script checks if the file contains smt=off, if it’s missing it will be added to grub.

Quick Quality-of-Life Improvements

If you are running your system with SMT enabled, you need to add the following lines to /etc/default/grub GRUB_CMDLINE_XEN_DEFAULT="$GRUB_CMDLINE_XEN_DEFAULT smt=off" GRUB_CMDLINE_XEN_DEFAULT="$GRUB_CMDLINE_XEN_DEFAULT smt=on" It’s the only way to keep kernel updates from disabling smt, by automatically adding the smt=off line to the end of the file.