It's all about KEYDB.cfg .. find a newer one and things might work.
Currently, the latest KEYDB.cfg (what I could find) is dated of 2017-03-19. The link mentioned in the header (aacs) is not maintained at the moment.
So playback of Bluray and Linux (if it depends on a working KEYDB.cfg) is dead at the moment.
I will watch this subject and I will get back, when there are any news...
regards
Fasterix