Quote:
Originally Posted by edeniz
 , DNSB!
Somehow I didn't see that thread, or I would have tried that first before I posted mine. Oops.
It did actually work, so no starting problems anymore. Yay!
But I'm still left baffled. Why now so suddenly? Did calibre not require that dependency previously or something? Because presumably, it was missing on my PC all along anyway, and yet calibre still worked? 
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I would guess that the linux os you are using is past end of life and is no longer getting updates. My recommendation is to go to
DistroWatch and check.
if it is past end of life then upgrade to the latest version, the improvements in the Mesa video driver are well worth it.
bernie