Public bug reported:
On ubuntu 20.04, with latest kernel and systemd, it will show error on
ThinkPad X1.
sd-umount[1334]: Failed to unmount /oldroot: Device or resource busy
systemd 245.4-4ubuntu3.6
kernel: 5.8.0-53
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "error.jpg"
https://bugs.launchpad.net/bugs/1928200/+attachment/5496620/+files/error.jpg
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https://bugs.launchpad.net/bugs/1928200
Title:
Prompt error message "Failed to unmount /oldroot" when shutdown or
reboot
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