[4.3.0.12] Jolla camera (also torch) does not start at all - as well as videos do not play

Regarding the ‘discussion’ above I summarize @deusexbeer, @abranson, @peterleinchen advices and put the solution pointer to this here:

devel-su; 
ssu rr adaptation-common; 
rm -r /var/cache/ssu/; 
ssu ur; 
pkcon refresh; 
version --dup; 
#sync; reboot;
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