Add the repository ppa:dannyedel/dspdfviewer
to your system source list
and install from it.
You can do this by running
sudo add-apt-repository ppa:dannyedel/dspdfviewer
# the system will ask for your password and confirmation
sudo apt-get update
sudo apt-get install dspdfviewer
To see which version of dspdfviewer
is included in which Ubuntu release,
check out the following pages: