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Re:What's new in Ubuntu 19.04 by qznc on Thursday April 18, 2019 @01:39PM (#19693013)
16.04 is still supported for two more years. 14.04 support ends in 12 days (or longer if you pay Canonical).

https://www.ubuntu.com/about/release-cycle

Re:What's new in Ubuntu 19.04 by j1elo on Thursday April 18, 2019 @08:34PM (#19696050)
This page also shows a nicely presented table with Ubuntu versions and expected support dates:

https://wiki.ubuntu.com/Releases