Output from 'groups' is suddently different to /etc/group
I am actually using Kubuntu 16.04.4, but I believe this question has to
do with the Ubuntu base, therefore I am asking in this mailing list.
I have been using this system for years without problems. I wanted to
run another Linux in a virtual machine, so I installed VirtualBox, and I
saw severe memory leaks in Xorg which brought the system down. So I
decided to try virt-manager instead.
Up installation, it did not work, I had to install additional libvirt
and Qemu packages, until it did work. I had done it before on another
system, at that time an Xubuntu 16.04.4. I noticed at the time that
installing those packages added groups 'libvirtd' and 'kvm' to /etc/group .
I found it unfortunate that the installer (Synaptic) did not warn me
that I had to log out and in again. I expected that everything would
work straight away, but my user account was not immediately a member of
those groups. I guess that this is a limitation of the underlying Debian
APT system. In any case, I did realise, and after a system restart,
everything worked properly. Unfortunately, I do not have access to that
Xubuntu system anymore.
I repeated the same on my Kubuntu system, and everything worked the
same. But after a couple of days, I noticed problems everywhere. The
reason is that my user account was only member of 1 group (with the same
username), and was not a member of any of the other usual groups. That
is what I mean:
$ groups $USER
rdiez : rdiez adm tty dialout cdrom sudo dip plugdev fuse lpadmin
sambashare wireshark libvirtd
If I go through "su", group membership is fine again:
$ su - "$USER"
rdiez adm tty dialout cdrom sudo dip plugdev fuse lpadmin sambashare
This discrepancy is apparently nothing surprising, for it is described here:
However, I did not have this problem before, and it is becoming a pain.
I do not know if KVM/Qemu is the really the cause (it is only a
suspicion), or it is something else, like the latest system updates.
I guess that the login manager / SystemD / whatever is not handling
group membership correctly, even though "su" can. I would like to know
how I can "debug" my system to restore it to the previous state, where
my account was member of all groups right from the start.
Please copy me on all the answers, for I am not subscribed to this
Thanks in advance,