Hello, This actually looks like three different bugs.
The first traceback (relating to /usr/share/images/desktop-base/desktop-background) seems to involve misdetecting image file formats somewhere. To help debug this further, could you reply with the output of: ls /etc/alternatives/desktop-background -lah For the second error (cannot identify image file), I suspect a corrupt image file. Does the file it mentions (/home/shirish/.config/variety/Downloaded/flickr_user_www_flickr_com_photos_peter_levi__user_id_93647178_N00_/7527884976_7d72041417_o.jpg) seem like a working JPEG? If not, try deleting it and see if the issue disappears. The "unary operator expected" issue is a mistake on my part and will be fixed in the next upstream release (0.6.7) Hope this helps, James
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