Ubuntu 18.04.5 LTSさんがリブートしてって
$ sudo sh -c 'apt update && apt dist-upgrade -y'
:
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
$ cat /var/run/reboot-required*
*** System restart required ***
linux-base
$ sync; sync; sync; sudo reboot
sync 3回ねむいのサイン(-人-)