Problems with installing libmraa

after i run: sudo apt-get install libmraa
it returns

rock@rockpis:~/libmraa$ sudo apt-get install libmraa
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libmraa : Depends: libjson-c3 but it is not installable
          Depends: python3.5 but it is not installable
          Depends: libpython3.5 but it is not installable
E: Unable to correct problems, you have held broken packages.

i tried a buch of thinks before. At the begining it wanted a libpython3.6 and python3.6. I have installed python 3.8. Im also using Ubuntu Ubuntu 20.04.6 LTS rockpis 4.4.143-69-rockchip-g8ccef796d27d.
any help?

Hi Vitek

What is the hardware version of the PI-S you are using?
What kind of startup are you using?

You can try using this:
https://python-periphery.readthedocs.io/en/latest/

Hardware version is 13.
I don’t know what is meant by startup

MRAA not supports ROCK PI S yet.