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
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