Comment 3 for bug 1841225

Verified ubuntu-release-upgrader 19.04.16.7 as per the test-case.

I set up a multipass bionic system, switched /etc/update-manager/release-upgrades to Prompt=normal, installed ubuntu-desktop and made sure there is no core18 snap installed. I then proceeded with running `do-release-upgrade --frontend DistUpgradeView --proposed`. The upgrade succeeded,confirmed that 19.04.16.7 was used [1] and checked that in the end all snaps got installed with the right channels selected (stable for core18 and stable/ubuntu-19.04 for others).

[1] 2019-10-09 14:14:11,811 INFO release-upgrader version '19.04.16.7' started