Would really appreciate help as I am stuck with this problem and am now posting here as I did not get a response to this question on Ubuntu forums.
I upgraded a Dell Precision workstation 3450 that came pre-installed with Ubuntu 20.04 to 22.04. After the upgrade to 22.04, I am unable to shut down the computer using either the power off option (clicking on the power off/log out button on the top right) or with sudo poweroff (sudo shutdown -P or sudo shutdown -h now). In both cases, the machine simply reboots / restarts. The only way to shutdown is by forcing a shutdown by long-pressing the main power button on the CPU.
When I try to shutdown normally, the following lines flash briefly on the console each time and it reboots:
[ 25.433431] sd-umoun[2594]: Failed to unmount /oldroot: Device or resource busy
[ 25.434705] sd-umoun[2595]: Failed to unmount /oldroot/sys: Device or resource busy
[ 25.442580] shutdown1: Failed to finalise file systems, ignoring.
This seems to be similar to a problem reported long ago for 12.04 here. As suggested there, should I edit sudo editor /etc/default/grub and change :
GRUB_CMDLINE_LINUX_DEFAULT="acpi=noirq quiet splash"
(have not tried this as I am not sure it is the right fix).
Note: I have Linux kernel 5.14.0-1034-oem #37-Ubuntu SMP and for some reason despite running sudo apt update and sudo apt ugprade or sudo apt dist-upgrade, the system has not updated to kernel 5.15.
I would appreciate any help/suggestions on how to fix this asap.
Thanks much, trsr
