Comment 2 for bug 2061981

Not a duplicate
It's specific to the latest chromium snap update: it worked fine last week. (using chromium only for specific sites. The firefox-esr PPA is my daily driver).

Other snaps don't have this problem. They're still working as they did last week.

And I'm not the only one, See also:
https://forum.snapcraft.io/t/chromium-cannot-update-snap-namespace-cannot-expand-mount-entry-none-home-local-share-none-x-snapd-kind-ensure-dir-x-snapd-must-exist-dir-home-0-0-cannot-use-invalid-home-directory/39764