I think I may have found it....  It looks like policykit has some rules
with entries like:

```
subject.isInGroup("sudo")
```

That's ... broken. Just being in the `sudo` group should *NOT* let me
install software or elevate my priviledges, *ESPECIALLY* if the user
isn't actually in the sudoers. It's a broken assumption.

I changed the /etc/sudoers file so the `sudo` group does *NOT* have
permissions explicitly for this reason.

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https://bugs.launchpad.net/bugs/1850977

Title:
  Snap installs software without user having sudo access

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