Bug#967941: Bug appeared again

[Santiago Batista]

Hello,

I'm affected by this problem as well on bookworm (and bullseye before
that).

Sébastien's suggestion did work for me, merci !
Nautilus properly (and promptly) generates all video thumbnails.

In my case, I needed to install:
    * libopenblas0-serial
    * libopenblas-serial-dev
in order to satisfy the dependencies of python3-matplotlib, while
removing libopenblas0-pthread.

Best regards,
Santiago