Mendeley desktop won't work on ubuntu 16.04
Open a terminal and run
sudo apt-get install libqtsvg4-perl libqtwebkit4
I had this exact error and after Mark Kirby's answer I still had the problem. After running the above, now Mendeley launches and syncs all my data (yeah!).
What I don't know is if it was just what I wrote above or if you need this and also Mark Kirby's answer both.
Source of answer: http://ubuntuforum-br.org/index.php?topic=120046.0
You seem to be missing some dependencies qtwebkit
and qtsvg
Open a terminal and run
sudo apt install qt4-dev-tools
Now try to run it again.