Apr  4 15:50:51 dello gdm-session-worker[3414]: pam_succeed_if(gdm:auth): error retrieving information about user nslcd_proc
Apr  4 15:51:04 dello pkexec[3421]: gdm: The value for the SHELL variable was not found the /etc/shells file [USER=root] [TTY=unknown] [CWD=/] [COMMAND=/usr/sbin/gnome-power-backlight-helper --set-brightness 15]
Apr  4 15:51:17 dello gdm-session-worker[3414]: pam_unix(gdm:auth): check pass; user unknown
Apr  4 15:51:17 dello gdm-session-worker[3414]: pam_unix(gdm:auth): authentication failure; logname= uid=0 euid=0 tty=:0 ruser= rhost=
Apr  4 15:51:17 dello pkexec[3423]: gdm: The value for the SHELL variable was not found the /etc/shells file [USER=root] [TTY=unknown] [CWD=/] [COMMAND=/usr/sbin/gnome-power-backlight-helper --set-brightness 15]
Apr  4 15:51:42 dello pkexec[3429]: gdm: The value for the SHELL variable was not found the /etc/shells file [USER=root] [TTY=unknown] [CWD=/] [COMMAND=/usr/sbin/gnome-power-backlight-helper --set-brightness 15]