こっちはUbuntu 20.04.6 LTS

$ sudo sh -c 'apt update && apt dist-upgrade -y'
:
The following packages will be upgraded:
dirmngr gnupg gnupg-l10n gnupg-utils gnupg2 gpg gpg-agent gpg-wks-client
gpg-wks-server gpgconf gpgsm gpgv sosreport
13 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
12 standard LTS security updates
:
$ cat /var/run/reboot-required*
cat: '/var/run/reboot-required*': No such file or directory

ヨシ

0

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