PDF thumbnails are missing in Dolphin
As suggested by user26687 the solution mentioned in the bug report seems to solve the problem:
- install the needed thumbnailers
-
make a symbolic link to the installed thumbnailers in the qt5 plugins folder, run:
sudo ln -s /usr/lib/x86_64-linux-gnu/plugins/* /usr/lib/x86_64-linux-gnu/qt5/plugins/
Replace x86_64-linux-gnu with i386-linux-gnu for 32bit.
Note: the problem still exists in Ubuntu 16.04.1 LTS xenial xerus.
The bug is also known in Launchpad.