For CentOS 7.4 Linux and more recent versions, probably:
Confirm what ArtemL and Hunter Frazier said. This saved me a lot of time. I have to start "gnome-control-center" from a terminal window, then Devices > Keyboard > "Switch Windows of an Application" has to be set to something. On my CentOS-7 machines, the option default is indicated as "disabled", but it is in fact, still active. Specifically, I changed it to "shift-ctrl-alt-w".
This solved a serious problem where an old APL application, running inside an emulator (DOSbox) was not able to use the APL "diamond" character, generated by the "alt-~" (alt-tilde) sequence. On CentOS-7, there is no "System / Preferences ...", and the "Tweak" tool is of no use for this. Thanx for posting CentOS info.
It worth mentioning that it worked for me on Ubuntu 14.04, and even carried to previous installation of 16.04 during upgrade, however same steps stopped working for me on a fresh install. – SyRenity – 2017-02-14T18:38:36.147
did you ever find a solution? It seems like there are many keyboard settings that you need to change on Ubuntu for keyboard centric IntelliJ to work cleanly. Maybe someone should create a script for this? – Gary – 2017-08-08T18:00:25.350