Hi Richard, very interesting, you are right. The Bionic lxd.preinst
script has:

# Add each admin user to the lxd group - for systems installed
# before precise
for u in $(getent group admin | sed -e "s/^.*://" -e "s/,/ /g"); do
    adduser "$u" lxd >/dev/null || true
done

I tried to install Bionic from the ISO image and I can confirm the admin
group doesn't get automatically created at install time. This only
affects Bionic as in >= Focal lxd is a snap, and I'm pretty sure the
snap doesn't touch the groups.

I filed this bug against the lxd package for the lxd maintainers to have
a look:

https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/1950635

Thanks again for raising the issue!

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https://bugs.launchpad.net/bugs/1942195

Title:
  Installing Samba unexpectedly adds many unknown local users to
  sambashare group

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