*** This bug is a duplicate of bug 2152801 ***
    https://bugs.launchpad.net/bugs/2152801

In AppArmor context, it might be a different bug.

- actual (maybe resolute, stonking) Ubuntu's systemd doesn't use utmp 
mechanisms, and is using  /run/systemd/sessions/.
- gnuwho has ability to read from systemd's dir, but actual AppArmor profile 
prevent to access.
- so IMHO /etc/apparmor.d/who should have below to get valid result for gnuwho. 

```
/run/systemd/sessions/* r,
```

Mitigation: To avoid this behavior, make /etc/apparmor.d/local/who and
write above one line, and exec to reload profile.

$ sudo apparmor_parser -r /etc/apparmor.d/who

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https://bugs.launchpad.net/bugs/2155139

Title:
  'who' coreutils-from-uutils  uucore/en-US.ftl apparmor denied

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