Read PDF files in Chromium
We can easily surpass this problem by using the official PDF plugin shipped with Chrome. In order to do that in a Linux we will have to extract the .deb file of Chrome and place the plugin somewhere else. Let's see.
First, you have to download the development version of Chrome, download the version according to your achitecture, either 64 bits or 32 bits. After you download the file, open a terminal and, assuming your file is in the "Downloads" folder, type
cd ~/Downloads ar vx google-chrome-unstable_current_amd64.deb tar --lzma -xvf data.tar.lzma
Change the last part of the filename from ...amd64.deb to ...i386.deb if you use a 32 bits system. This will extract the files within the .deb you downloaded. Now, let's grab the plugin and place it in the propper folder. If you use Mint or Ubuntu.
sudo cp opt/google/chrome-unstable/libpdf.so /usr/lib/chromium-browser/plugins/
If you use openSUSE (if you have a 32 bits system write lib instead of lib64)
$ sudo cp opt/google/chrome-unstable/libpdf.so /usr/lib64/chromium/
and finally, check if it's working, if it's not lets give the file permission to run. In Ubuntu and Mint
$ sudo chmod a+x /usr/lib64/chromium-browser/libpdf.so
$ sudo chmod a+x /usr/lib64/chromium/libpdf.so
That's all. At this point your Chromium installation should be able to read PDF files.