Ubuntu 14.04.6 LTS+ESMわよ
$ apt list --upgradable
Listing... Done
libsasl2-2/trusty-infra-security 2.1.25.dfsg1-17ubuntu0.1~esm2 i386 [upgradable from: 2.1.25.dfsg1-17ubuntu0.1~esm1]
libsasl2-modules/trusty-infra-security 2.1.25.dfsg1-17ubuntu0.1~esm2 i386 [upgradable from: 2.1.25.dfsg1-17ubuntu0.1~esm1]
libsasl2-modules-db/trusty-infra-security 2.1.25.dfsg1-17ubuntu0.1~esm2 i386 [upgradable from: 2.1.25.dfsg1-17ubuntu0.1~esm1]
$ sudo sh -c 'apt-get update && apt-get upgrade -y'
sasl更新さする？
$ cat /var/run/reboot-required*
cat: /var/run/reboot-required*: No such file or directory
ヨシ