Search in forum shows that people encountered the problem above resolved it with installing "Raspberry Pi Tools" add-on.
Tried even download the latest tar.gz from RPi.GPIO · PyPI and install it manually => failed on missing compilers and dependencies...
Tried to uninstall the "Raspberry Pi Tools" add-on and install it again.
Tried to install "System tools" too... maybe dependecies... No luck.
Running LE 9.2.0 + Kodi 18.5. Log.
I noticed, when installing add-on, it reports on dependency of LE 9.1, not 9.2. Can be this a root cause of poor installation of RPi.GPIO?
Is it possible to manage packages from command line(shell, bash)? How?
I might try to install pigpio or RPIO...