Found it, and I closed it because the screen flickering is gone:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2018448
But the "Atomic update" error was there, on pipe A if that makes any difference. I see it on A/B/C, very much like https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1806242
Found it, and I closed it because the screen flickering is gone:
https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/2018448
But the "Atomic update" error was there, on pipe A if that makes any difference. I see it on A/B/C, very much like https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1806242