addgroup is a perl script, so you can inspect it to see what's going on.
You can get additional information about the error running with:
sudo VERBOSE=1 addgroup --system ntp
I think what we're seeing is that your ntp group is a user group (gid >=
1000) instead of a system group (gid < 1000).
>From your output above, it looks like you're hitting this logic:
if ($action eq "addsysgroup") {
# Check if requested group already exists and we can exit safely
my $ret = existing_group_ok($new_name, $new_gid);
if ($ret == 3) {
print STDERR "$0: " if $verbose;
printf STDERR (gtx("The group `%s' already exists as a system group.
Exiting.\n"), $new_name) if $verbose;
exit RET_OK;
}
if ($ret == 1) {
print STDERR "$0: " if $verbose;
printf STDERR (gtx("The group `%s' already exists and is not a system
group. Exiting.\n"), $new_name) if $verbose;
exit RET_OBJECT_ALREADY_EXISTS;
}
So, you're exiting 1 due to the gid of group ntp being > 1000. The fix here
would be to apt-get remove --purge ntp ; the --purge flag will trigger the
ntp.postrm script to remove the group first. Then when you re-install, it will
install the ntp group with --system flag and allocate a GID under <1000.
See if that helps you moving forward.
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https://bugs.launchpad.net/bugs/1372051
Title:
ntp postinst user/group add commands are not idempotent
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