alt key shortcuts in pycharm are not working on Ubuntu 16.04
Shortcuts involving the Alt key are not working in pycharm.
For example the shortcut for "finding usages" on my machine is Alt+F7, but whenever I press this key, my cursor changes from an arrow to a hand (the icon it changes to when you move a window).
I am using Ubuntu 16.04.
The solution that worked for me is described in this Ask Ubuntu answer.
In short: if you've already got used to combinations like Alt+F7, you can disable/change default Ubuntu shortcuts which are overlapping with default shortcuts used in PyCharm.