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Re:Ubuntu 16.04: “Out of memory” errors after upgrade to 4.4... by richardwhiuk on Sunday January 29, 2017 @04:04AM (#13513198)
apt-get update won't do anything beyond download the latest view of the repository.

you want:

apt-get update && apt-get dist-upgrade && apt-get autoremove

Re:Ubuntu 16.04: “Out of memory” errors after upgrade to 4.4... by dfc on Sunday January 29, 2017 @03:19PM (#13516340)
Aptitudes full-upgrade is synonymous with dist-upgrade.