The error goes away after running `sudo sysctl -w
kernel.apparmor_restrict_unprivileged_userns=0` and it can be launched
successfully.
The value being `1` also stopped the `anki` package from Universe
starting. In that case the error was
```
[963029:963029:1003/134821.262544:FATAL:credentials.cc(
Sorry that extra `c` at the end is a typo.
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https://bugs.launchpad.net/bugs/2083567
Title:
mpdscribble when starting as user systemd service
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