Thanks @Wolfgang_S & @apella12 I found what was happening after reading your words. There are 2 different possible connections via SSH with OH3:
ssh -p 8101 openhab@localhost (openhab/habopen) --> Karaf console
ssh -p 22 openhabian@localhost (openhabian/openhabian) --> Linux console
I was connecting to Karaf but trying to follow instructions where installing packages were required, that’s why my confussion and question, how to connect.
Thanks all!!! Solved.