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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1890365 Title: [snap] Web Serial fails to access local device To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1890365/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs