This also breaks the new fetch feature for me and I suspect has been the cause of some of the other reported bugs and crashes.
After manually correcting the symlink /usr/share/calibre/fonts/liberation to point to ../../fonts/truetype/liberation/ calibre is working again for me.
Looks like Debian had the same issue: http:// bugs.debian. org/cgi- bin/bugreport. cgi?bug= 674838
This also breaks the new fetch feature for me and I suspect has been the cause of some of the other reported bugs and crashes.
After manually correcting the symlink /usr/share/ calibre/ fonts/liberatio n to point to ../../fonts/ truetype/ liberation/ calibre is working again for me.