Could not configure PAM for SSH authentication

Hallo, guys

I'm trying to run LTSP20 on Debian Bullseye (testing). I do it 
accordingly to https://ltsp.org/docs/installation/

I don't see any problem during installation, but the client bootup 
process ends with:


Could not configure PAM for SSH authentication!

LTSP command failed: /usr/share/ltsp/client/login/pamltsp install

Stopping plymouth

Aborting ltsp


Please, does anybody have an idea, what could be the culprit? Google 
dosen't give a clue.




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