I was able to get my computer to reliably shutdown by doing two things: 1. Update the intramfs:
$ sudo update-initramfs -u I'm not sure why this was necessary, since I have the default 21.04 kernel: 5.11.0-16-generic 2. Add `acpi=force` to /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force modprobe.blacklist=nouveau" ...and update grub: $ sudo update-grub I'm not sure why this is necessary, since I have a newer BIOS. This has never been necessary for prior versions of Ubuntu. Nevertheless, my laptop will consistently not shut down without this parameter. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1926816 Title: Computer does not shut down To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1926816/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs