Looks like you're on Fedora Silverblue (or other Atomic version). This is happening because the system groups are in /usr/lib/group rather than /etc/group and this causes the issue you're seeing here. You can work around it by getting into a root shell with something like

sudo -i

and then getting the group added to /etc/group with

grep -E '^dialout' /usr/lib/group >> /etc/group

after that, you'll be able to add your user to the group with

usermod -aG dialout pipe

[–] Artyom@lemm.ee 9 points 6 months ago (1 children)

Is that considered a feature for some reason? That seems objectively terrible.

[–] fortified_banana@beehaw.org 8 points 6 months ago

No, it's a side effect of how everything's handled by rpm-ostree currently, and it's on the list of issues to be fixed.

See Here for more info

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