Mengatasi Unable to register authentication agent Linux CentOS GDBus.Error
Pertama
mount proc -o remount,hidepid=2
systemctl restart polkit.service
Kemudian jika tampil error WARNING lagi, kita ganti dengan perintah ini
mount proc -o remount,hidepid=0
systemctl restart polkit.service
https://idnetter.com/mengatasi-unable-to-register-authentication-agent-linux-centos/
Ref: https://bugs.centos.org/view.php?id=17291