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UPDATE: After rebooting I tried to start Calibre in console and it started !
But with the following messages coming up in the console:
FATAL: Error inserting nvidia340 (/lib/modules/4.18.11-pclos1/kernel/drivers/char/drm/nvidia340.ko): Operation not permitted
FATAL: Error running install command for nvidia
FATAL: Error inserting nvidia340 (/lib/modules/4.18.11-pclos1/kernel/drivers/char/drm/nvidia340.ko): Operation not permitted
FATAL: Error running install command for nvidia
QXcbIntegration: Cannot create platform OpenGL context, neither GLX nor EGL are enabled
Falling back to using screens root_visual.
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