This has been fixed upstream in Debian and is fixed in 14.04
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=664182 so I will mark
it as fixed release (technically, 12.04 is still supported, but I doubt
this merits a SRU).
** Bug watch added: Debian Bug tracker #664182
Bug still affects Ubuntu 12.04 as well. I've posted in the link below a
slightly updated desktop file:
http://www.guyrutenberg.com/2013/09/28/openning-mobi-and-epub-files-in-
ubuntu/
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: calibre (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/907899
Title:
** Patch added: .desktop file I use locally
https://bugs.launchpad.net/bugs/907899/+attachment/2644143/+files/ebook-viewer.desktop
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https://bugs.launchpad.net/bugs/907899
Title:
The attachment .desktop file I use locally of this bug report has been
identified as being a patch. The ubuntu-reviewers team has been
subscribed to the bug report so that they can review the patch. In the
event that this is in fact not a patch you can resolve this situation by
removing the tag
