journalctl -f
pkexec[11203]: gdm: Error executing command as another user: Not authorized [USER=root] [TTY=unknown] [CWD=/var/lib/gdm3] [COMMAND=/usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 155]
lsb_release -a LSB Version: core-9.20160110ubuntu5-amd64:core-9.20160110ubuntu5-noarch:security-9.20160110ubuntu5-amd64:security-9.20160110ubuntu5-noarch Distributor ID: Ubuntu Description: Ubuntu 17.10 Release: 17.10 Codename: artful
journalctl -f
pkexec[11203]: gdm: Error executing command as another user: Not authorized [USER=root] [TTY=unknown] [CWD=/var/lib/gdm3] [COMMAND= /usr/lib/ gnome-settings- daemon/ gsd-backlight- helper --set-brightness 155]
lsb_release -a 20160110ubuntu5 -amd64: core-9. 20160110ubuntu5 -noarch: security- 9.20160110ubunt u5-amd64: security- 9.20160110ubunt u5-noarch
LSB Version: core-9.
Distributor ID: Ubuntu
Description: Ubuntu 17.10
Release: 17.10
Codename: artful