I tested a second upgrade from bionic to focal with my PPA enabled and this time libomp5 was identified as an "Unused dependencies" and a "remove_candidates". However, this time it was actually marked for removal while previously this appeared in /var/log/dist-upgrade/main.log:
2020-08-22 09:49:11,854 DEBUG package 'libomp5' produces an unwanted removal 'gnome-software-plugin-snap', skipping
2020-08-22 09:49:12,751 DEBUG 'libomp5' scheduled for remove but not safe to remove, skipping
So I think the debian/control changes in the PPA work but something else is wrong with the release-upgrader and the snap removal work.
I tested a second upgrade from bionic to focal with my PPA enabled and this time libomp5 was identified as an "Unused dependencies" and a "remove_ candidates" . However, this time it was actually marked for removal while previously this appeared in /var/log/ dist-upgrade/ main.log:
2020-08-22 09:49:11,854 DEBUG package 'libomp5' produces an unwanted removal 'gnome- software- plugin- snap', skipping
2020-08-22 09:49:12,751 DEBUG 'libomp5' scheduled for remove but not safe to remove, skipping
So I think the debian/control changes in the PPA work but something else is wrong with the release-upgrader and the snap removal work.