[–] beetusvoater 0 points 2 points 2 points (+2|-0) ago (edited ago)
If all else fails, you can just specify the version you want (didn't try it, but you do it by appending a "=" and the Version you want to have.).
sudo apt-get install libreoffice=1:5.0.0~rc5-0ubuntu1~trusty1
Your problem seems to be related to pinning... I didn't look deeper into it, but you might want to if you wan to have a more permanent solution.
EDIT: checked the command and corrected it.