Adding
@{PROC}/tty/drivers r,
to /var/lib/snapd/apparmor/profiles/snap.chromium.chromium did the trick.
The file actually had rwk permissions set to TTY*, and ACM* (mine is one
of those), according to the comments in the file.
There was no output in journalctl.
This can be considered a fix, and a return to normal operation for
chromium. It should probably be changed for the distribution, not sure
who can do that.
Thanks.
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https://bugs.launchpad.net/bugs/1890365
Title:
[snap] Web Serial fails to access local device
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