I know it looks like it does not recognise the image format,
but using this command fixes the issue, in fact i added this command to my
/etc/rc.local so i can keep apparmor up and running, after that it generates
all the thumbnails correctly for the differents formats of ebooks, and it
doesn't
I also have an issue with the thumbnailer but it only occurs using Nemo
file browser and only when browsing SMB share folder:
https://bugs.launchpad.net/ubuntu/+source/evince/+bug/1834386
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Public bug reported:
Nemo is unable to generate ebooks thumbnails over SMB share because of
evince-thumbnailer apparmor profile(note that Nautilus is able to do it
anyway), i removed apparmor to see and it fixed that issue.
Nemo output when generating thumbs:
