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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
It’s like when I run into some issue with how I’ve set up my system in NixOS and have to explain to a non-Linux user that it isn’t Linux that’s the issue but how I’m using an especially weird Linux lol