Ubuntu 18.04.6 LTSわよ
3 updates can be applied immediately.
3 of these updates are standard security updates.
$ apt list --upgradable
Listing... Done
libsasl2-2/bionic-updates,bionic-security 2.1.27~101-g0780600+dfsg-3ubuntu2.4 amd64 [upgradable from: 2.1.27~101-g0780600+dfsg-3ubuntu2.3]
libsasl2-modules/bionic-updates,bionic-security 2.1.27~101-g0780600+dfsg-3ubuntu2.4 amd64 [upgradable from: 2.1.27~101-g0780600+dfsg-3ubuntu2.3]
libsasl2-modules-db/bionic-updates,bionic-security 2.1.27~101-g0780600+dfsg-3ubuntu2.4 amd64 [upgradable from: 2.1.27~101-g0780600+dfsg-3ubuntu2.3]
$ sudo sh -c 'apt update && apt dist-upgrade -y'
$ cat /var/run/reboot-required*
cat: '/var/run/reboot-required*': No such file or directory
ヨシ