Error details:
After installing cyberpanel, you see the below error from shell when running any command:
** (pkttyagent:8559): WARNING **: 02:28:34.621: Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject Error registering authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject (polkit-error-quark, 0)
Resolution:
The error is appearing because cybepranel adds the following line in your fstab:
proc /proc proc defaults,hidepid=2 0 0
This is hiding the /proc from your shell that uses polkit. To fix this, keeping the above mount rule, you need to add a group for polkitd user and assign that group to to access /proc. You may do this using the following:
groupadd nohideproc usermod -a -G nohideproc polkitd mount -o remount,rw,hidepid=2,gid=nohideproc /proc systemctl restart polkit systemctl restart polkit (do this twice)
Once done, you may edit your fstab, and comment the old line, add the following line:
# Edit your fstab: nano /etc/fstab # comment the following line : from : proc /proc proc defaults,hidepid=2 0 0 to : # proc /proc proc defaults,hidepid=2 0 0 # add the following line proc /proc proc defaults,hidepid=2,gid=nohidproc 0 0
Good luck.