Comment 2 for bug 1339518

Just noticed this today, it's still the same on Ubuntu 20.04. The default sudoers file ships the admin group having sudo privileges but the group doesn't exist by default.

While it doesn't have out of the box security implications, I think this is a security concern as someone could potentially add an 'admin' user and not expect them to get sudo access with the default matching group name created for them.

For example downstream products like web hosting or control panel style tools that creates users with a user-provided name. Since neither the user or group 'admin' exists by default they could be fooled into creating escalatable privileges.