One problem is that the 3.20.5-0ubuntu0.16.04.6 update got stuck in phased-updates. Also, the similar bug for Ubuntu 17.04 has *never* been fixed for all users because of phased-updates.
https://people.canonical.com/~ubuntu-archive/phased-updates.html
One problem is that the 3.20.5- 0ubuntu0. 16.04.6 update got stuck in phased-updates. Also, the similar bug for Ubuntu 17.04 has *never* been fixed for all users because of phased-updates.
https:/ /people. canonical. com/~ubuntu- archive/ phased- updates. html