Ubuntu 20.04.6 LTSもいっとこ
$ sudo sh -c 'apt update && apt dist-upgrade -y'
:
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
だーけーどー
$ cat /var/run/reboot-required*
*** System restart required ***
linux-image-5.4.0-212-generic
linux-base
$ sync; sync; sync; sudo reboot
(-人-)