installed (local or obsolete) category is filling up because Canonical lately has been pushing out updates and then pulling them back. It's happened with two kernels in the recent past and it happened again with
cups this morning. I've been using Ubuntu for about three years now and I do not remember this happening as often as it has this year.
So, how to rationally deal with this?
I thought about only installing updates once per week, but that would not protect against grabbing that bad update that they pushed out right before I checked that week.
Is a good strategy to only install updates on the weekend? It seems that system updates are not often pushed out on weekends. I suppose they could push a bad update on Friday afternoon and pull it on Monday morning.
Or, somehow not install updates until they have been pushed out for a certain time period - like two days? Is there an automated way to do that?
Edit: One of the affected systems runs Lubuntu 16.04 with the
linux-generic kernel, the other runs Lubuntu 16.04 with the
linux-generic-hwe-16.04 kernel. Both were affected by a
cups version 2.13-4ubuntu0.2 update that was pushed out and then pulled back on March 27th, 2017. The
linux-generic machine received a kernel update version 126.96.36.199.12 that was subsequently pulled back. This update also orphaned
snapd version 2.23.1 The
linux-generic-hwe-16.04 machine received a kernel version 188.8.131.52.14 that was then orphaned.