I had the same problem and 'fixed' it by renaming ~/.ICEauthority to ~/.ICEauthority.bak Also see http://oldbugs.calibre-ebook.com/ticket/6289
** Bug watch added: oldbugs.calibre-ebook.com/ #6289 http://oldbugs.calibre-ebook.com/ticket/6289 -- You received this bug notification because you are a member of Edubuntu Bugsquad, which is subscribed to calibre in Ubuntu. https://bugs.launchpad.net/bugs/597101 Title: Calibre fails converting to Mobi at final step To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/calibre/+bug/597101/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~edubuntu-bugs Post to : edubuntu-bugs@lists.launchpad.net Unsubscribe : https://launchpad.net/~edubuntu-bugs More help : https://help.launchpad.net/ListHelp