Comment 7 for bug 1915712

So after further troubleshooting I found what was issue in my case - having `gnome-3-28-1804` snap installed, but disabled.

After enabling it, `snap install chromium` now succeeds.

For the reference adding list of the related installed snaps:
```
$ snap list |egrep '(gnome|core|chromium|gtk)'
chromium 88.0.4324.150 1479 latest/stable canonical* -
core 16-2.48.2.1 10823 latest/stable canonical* core
core18 20210128 1988 latest/stable canonical* base
core20 20201210 904 latest/stable canonical* base
gnome-3-28-1804 3.28.0-19-g98f9e67.98f9e67 145 latest/stable canonical* -
gnome-3-34-1804 0+git.3556cb3 66 latest/stable canonical* -
gnome-calculator 3.38.0+git7.c840c69c 826 latest/stable/… canonical* -
gnome-characters v3.34.0+git9.eeab5f2 570 latest/stable/… canonical* -
gnome-logs 3.36.0 103 latest/stable/… canonical* -
gnome-system-monitor 3.38.0-17-g38c1ce1d62 157 latest/stable/… canonical* -
gtk-common-themes 0.1-50-gf7627e4 1514 latest/stable/… canonical* -
gtk2-common-themes 0.1 13 latest/stable canonical* -
```