My controllers are all in the same channel, but after upgrading to 3.1, 2 out of 3 of the rack controllers do not report their channel to the regional+rack controller so it gives this error. I’m not sure if this has any impact beyond a red and white X icon on the controller page. I can’t find anything here regarding this issue. Has anyone seen this? I have run the above snap refresh maas --stable, and they are all in the same state.
In case anyone else happens upon this, I issued snap list on my system that was working and compared what was installed to the 2 that were not working. There was an install of snapd from the snap command that came with 18.04 on the one that was working. I installed it on the other two: sudo snap install snapd and it started reporting the channel correctly. 18.04 was otherwise completely up to date on all of them.