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krillavilla avatar Ubuntu

libvirt-kvm and libvirt shows up as login profiles on Kubuntu 23.04

cn flag
krillavilla

Last night, I want to install Qemu on my Kubuntu 23.04. I found this article to follow along to install Qemu on my computer:

  1. Install and Use Qemu on Ubuntu

After reboot my pc, I notice libvirt-kvm and libvirt shows up as users you can login onto my computer:

users

I have done some research and I found this post Primary Groups vs. Supplement/Secondary Groups:

  1. Primary vs secondary groups in Linux

I am assuming libvirt and libvirt-kvm are added in my Primary Group.

Is this a MUST to have QEMU work properly on my PC?

if not, Is there a way for libvirt and libvirt-kvm users' profile not show up as login options?

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steeldriver
Interesting... the tutorial you linked says *"To make Qemu work, you'd have to add your user to two groups: libvirt-kvm and libvirt"* but AFAIK that's simply not what those commands do - even the link it provides in support says to use either `adduser` or `usermod` **not** `useradd`
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krillavilla avatar
cn flag
krillavilla
@steeldriver Do you know how I can fix this?
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hr flag
steeldriver

The tutorial that you linked says:

To make Qemu work, you'd have to add your user to two groups: libvirt-kvm and libvirt.

To do so, use the following commands one by one:

sudo useradd -g $USER libvirt

sudo useradd -g $USER libvirt-kvm

However those commands do not add a user to a group - as you have discovered, they create two new users, with their primary group (-g) name equal to the username of the invoking user. On Ubuntu, that happens to succeed because such a group exists by default (it is the user's private group). Since they are created as non-system users (UID > 1000) they show up in the display manager.

The link provided in the tutorial suggests two correct ways to add a user to a group: sudo adduser username groupname and sudo usermod -a -G group_name username. So for example:

sudo adduser "$USER" libvirt
sudo adduser "$USER" libvirt-kvm

or

sudo usermod -a -G libvirt "$USER"
sudo usermod -a -G libvirt-kvm "$USER"

however I'm not sure these are necessary - I'd suggest seeking out a more reliable tutorial.

Fortunately (at least with the default Ubuntu /etc/default/useradd) the commands that you were instructed to use may be undone fairly easily:

sudo userdel libvirt
sudo userdel libvirt-kvm
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