Where is it?
I am trying to get my virtualbox working correctly and needed to include me in a user group. The user management under system setting is useless.
I understand that KUser is no longer maintained or available. I did try to install LXQt-Admin as a work around but it wouldn't install with dependency issues.
Please don't tell me CLI is it. KDE and / or Neon really needs a top level / root admin tool like YAST in openSUSE.

users-admin from gnome-system-tools package works, and does not install very much else 'gnome' with it.

Not ideal, but....

sudo adduser "user name" vboxusers

I ran into this as well a while back. As acheronuk mentioned you can install gnome-system-tools, and then you’ll see it under “system” > add or remove users and groups. Then you can activate “vboxusers”, or what ever else you need.

acheronuk wrote:users-admin from gnome-system-tools package works, and does not install very much else 'gnome' with it.

Not ideal, but....

That is what i finished up doing. As you say it didn't load much Gnome but achieved exactly what I needed.

Mmm...
I would've said use kuser but it has been dropped from KDE apps
I see the old version--that I used to use--is still available in the Ubuntu 17.10 repo...
but I would not install it, even though for kubuntu and neon, it would still work... at least for the time being
So rats... it's back to command line!

Legion wrote:

acheronuk wrote:users-admin from gnome-system-tools package works, and does not install very much else 'gnome' with it.

Not ideal, but....

That is what i finished up doing. As you say it didn't load much Gnome but achieved exactly what I needed.

Glad that helped.

FYI, lack of group management in the Plasma user-manager module/kcm has been reported here at the very least:

https://bugs.kde.org/show_bug.cgi?id=365787

While the point of that module is to be 'simple', personally I can't see why some basic group management capabilities could not be added under an advanced tab/button/whatever, with suitable warnings if required. Even if kuser was resurrected somehow, IMO there should be some built in functionality besides installing an additional app.

acheronuk wrote:... While the point of that module is to be 'simple', personally I can't see why some basic group management capabilities could not be added under an advanced tab/button/whatever, with suitable warnings if required. Even if kuser was resurrected somehow, IMO there should be some built in functionality besides installing an additional app.

+1

shouldnt this be a thing?
I mean really?