Quote:
Originally Posted by bambuko
Further update:
Tried it with PClinuxOS LXDE and it fails if I run as user, but is perfectly happy if I run it as root.
No biggie - I am happy to run it as root 
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Be careful.
You run Calibre as a root once and then you always have to run it as root, because any changes you make will result in files where owner is root.
Then you will want to use the library as an ordinary user and Bad Things (TM) start to happen. Your Calibre will start to complain that it can't update some books, and other weird things.
Then you will spend a week investigating the issue, suspecting that your filesystem got damaged, or that your library integrity has been compromised.
Fortunately you can change owner for all files and directories from a command line, or using a good file manager (such as mc).
Do not change the file permissions with chmod 777 as some posters suggested.
It is not a good idea to run things as root. Believe me. Been there, done that, lived to tell the tale ;-)
Changing the owner - besides using sudo mc
sudo chown -R me /home/me/Calibre\ Library
or
find /home/me/Calibre\ Library/ -exec chown me {}
or something like that. Be careful, the above examples have to be tested that they do what you think they do.