Dear Maintainer,

on my system trying to adjust the display backlight with lxqt-config-brightness aborts with
sh: 1: pkexec: not found

rendering me unable to change the backlight via LXQt Settings or the respective shortcut keys.

After installing the pkexec package it works as expected.

How to reproduce:
0. Make sure pkexec isn't installed (e.g. via command dpkg -L pkexec)
1. Open a shell window in a LXQt session
2a. Execute lxqt-config-brightness -i or
2b. Execute lxqt-config-brighness -d or
2c. Execute lxqt-config-brightness and try to change the backlight via the GUI.

Regards,
Martin