I can also confirm that apt-get remove network-manager fixes the problem It's a little unclear to me why this fixes the problem or why it is there in the first place. However, since that's an easy fix, I am not sure this is really a bug in calibre.
A. -- Si Dieu est, l'homme est esclave ; or l'homme peut, doit ĂȘtre libre, donc Dieu n'existe pas. Et si Dieu existait, il faudrait s'en dĂ©barrasser! - Michel Bakounine
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