intellij navigate back shortcut not working - intellij-idea

I am using intellij 2017.3.2 and ubuntu 16.04 . I have a keyboard map shortcut in intellij for navigate back which is set to the default ctrl+alt+back arrow . Pressing these doesn't work. It does not do anything. When i would press it sometimes the a bar would pop up at the top of the gui for entering a command (for ubuntu) so I disabled this in ubunutu's keyboard shortcut menu. Still the navigate back does not work. Doing ctrl+windows-key+backarrow navigates somewhere- but not the standard intellij navigate back behavior. Does anyone have any suggestions for how to fix this?

Looks like a conflict with ubuntu shortcuts. See the thread on "Ask ubuntu" that may solve the issue.

Now IntelliJ has 'Default for GNOME' keymap with conflicted shortcuts remapped.
Navigate back/forward is Alt+Shift+Arrow keys

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