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#cwp update fix How to fix GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed BY SYSADMIN · PUBLISHED MAY 9, 2020 · UPDATED MAY 13, 2020 On centos 7, there are instances where you get the error 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)

This usually happens when trying to restart a systemd service. The workaround is as follows: groupadd -g 23 nohidproc usermod -a -G nohidproc polkitd mount -o remount,rw,hidepid=2,gid=nohidproc /proc systemctl restart polkit Add the following in /etc/fstab as well echo "proc /proc proc defaults,hidepid=2,gid=nohidproc 0 0" >> /etc/fstab

After mount the new mountpoint mount -a systemctl restart polkit