Ubuntu 14.04.6 LTS+ESMわよー
$ sudo apt update && apt list --upgradable
:
gnupg/trusty-infra-security 1.4.16-1ubuntu2.6+esm1 i386 [upgradable from: 1.4.16-1ubuntu2.6]
gpgv/trusty-infra-security 1.4.16-1ubuntu2.6+esm1 i386 [upgradable from: 1.4.16-1ubuntu2.6]
$ sudo apt-get upgrade -y
$ cat /var/run/reboot-required*
cat: /var/run/reboot-required*: No such file or directory