Ubuntu 14.04.6 LTS+ESM
$ sudo apt update && apt list --upgradable
:
python-twisted-bin/trusty-infra-security 13.2.0-1ubuntu1.2+esm2 i386 [upgradable from: 13.2.0-1ubuntu1.2+esm1]
python-twisted-core/trusty-infra-security 13.2.0-1ubuntu1.2+esm2 all [upgradable from: 13.2.0-1ubuntu1.2+esm1]
$ sudo apt-get upgrade -y
$ cat /var/run/reboot-required*
cat: /var/run/reboot-required*: No such file or directory