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I cannot open djvu files by qpdfview while qpdfview-djvu-plugin is installed. I really like qpdview and don't want to use other applications. Any suggestions?

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The underlying problem is that Qt5's QMimeDatabase changed DjVu MIME type from "image/vnd.djvu" to "image/vnd.djvu+multipage". It's already fixed in qpdfview 0.4.16 but it's not yet available in any repository at the time of writing despite being released 9 months ago.

Workaround is to build the updated package yourself:

wget https://launchpad.net/qpdfview/trunk/0.4.16/+download/qpdfview-0.4.16.tar.gz
sudo apt build-dep qpdfview
apt source qpdfview
cd qpdfview-0.4.14  
uupdate ../qpdfview-0.4.16.tar.gz
cd ../qpdfview-0.4.16
dpkg-buildpackage -us -uc -nc
cd ..
sudo dpkg -i qpdfview_0.4.16-0ubuntu1_*.deb qpdfview-djvu-plugin_0.4.16-0ubuntu1_*.deb
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    This is a comment on the answer of int_ua (but I'm not allowed to comment): I have the same problem, but your second command sudo apt build-dep qpdfview gives: Reading package lists... Done E: Unable to find a source package for qpdfview Can you clarify the instructions? EDIT: OK I figured out that by enabling source repositories as explained here: unix.stackexchange.com/questions/302927/… everything seems to work fine now, Thanks! – Phil168 Aug 18 '16 at 17:10
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This is a comment on the answer of int_ua (but I'm not allowed to comment):

On second thoughts this is not so great. For complicated reasons, after doing this it seems I then have the choice of not using qpdfview for ps files, or never being able to install any new packages. I have asked for help with this here:

suppress removal of "broken" package qpdfview-ps-plugin?

To echo the original question: I really like qpdfview and don't want to use other applications.

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