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At the login screen and also in the system settings I see a user that I don't really want to see in any interactive context. After all I am not being shown the nobody user (UID 65534)

Here's how that looks (I have no idea how to make a screenshot from the user list on the login screen, though):

Showing the undesired user

The details for that user account and the group of the same name can be gleaned from the output of the following sequence of commands ($ -> as user, # -> as root):

$ getent passwd libvirt-qemu
libvirt-qemu:x:64055:128:Libvirt Qemu,,,:/var/lib/libvirt:/usr/sbin/nologin
$ id libvirt-qemu
uid=64055(libvirt-qemu) gid=128(kvm) groups=128(kvm),64055(libvirt-qemu)
$ getent group libvirt-qemu
libvirt-qemu:x:64055:libvirt-qemu
# getent shadow libvirt-qemu
libvirt-qemu:!:18204:0:99999:7:::
# getent gshadow libvirt-qemu
libvirt-qemu:!::libvirt-qemu

Other than two users with UID 1000 and 1001 respectively, these are the only non-system users:

# getent passwd |awk -F : '$3 ~ /^[1-9][0-9][0-9][0-9][0-9]+/ {print $3 " " $1}'|sort -n
64055 libvirt-qemu
65534 nobody

I crafted the regex intentionally to leave out the two four-digit entries for privacy reasons.

Question: so how can I get rid of that user being listed in interactive contexts when that user clearly is not meant to be used interactively?

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Change the value for the SystemAccount key (in section [User]) in /var/lib/AccountsService/users/libvirt-qemu (or whatever the equivalent on your distro is) to true and restart AccountsService using sudo systemctl restart accounts-daemon.service. If there is no such line or file for that user, you can copy it from another user.

The contents of said file should look at least like this:

[User]
SystemAccount=true
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  • Bingo! That was it. Sweet. I copied the contents of gdm, which seemed to provide what you suggested. – 0xC0000022L May 2 '20 at 20:07

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