This kernel update was pushed out on Monday, and I updated most of our systems to it.
Today I got around to updating the last system, and the kernel update was not available. It appears that it was yanked from the repos.
On the system I tried to update today:
apt policy linux-generic linux-generic: Installed: 126.96.36.199.25 Candidate: 188.8.131.52.25 Version table: *** 184.108.40.206.25 500 500 [my local mirror]
On the systems updated Monday
apt policy linux-generic linux-generic: Installed: 220.127.116.11.26 Candidate: 18.104.22.168.26 Version table: *** 22.214.171.124.26 100 100 /var/lib/dpkg/status
Also my one remaining 16.04 system got this update Monday, and now it shows local/obsolete in synaptic.
Where can I see why this was done, and what are the consequences of remaining on this LTS kernel that was bad enough to be pulled back?
Related: Strategy to deal with Canonical's increasingly poor QA?
See the bug report: https://bugs.launchpad.net/ubuntu/bionic/+source/linux/+bug/1779827
Once this Critical bug was reported with enough detail, Canonical engineers and community volunteer testers bisected the problem and had a patch within 36 hours.
Note that this bug was critical, and worthy of pulling because booting at GRUB from previous kernels wasn't a viable workaround. Some folks reporting had to reinstall to restore functionality.