Running 2017.3.4 on Ubuntu 16.04
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Set up Intellij on an virtual Ubuntu box. Working well, however I can't seem to figure out (for me) this odd behavior.
It will only run in "docked" mode. Not full-screen mode, but simply locked to the window edges, unable to resize. Menu's are view-able for both the system and the application, but the intellij frame cannot be resized, minimized, etc., like this:

I don't see anything in the settings that might be causing this. Does Intellij not work as a normal windowed application in Ubuntu? All other apps seem to work normally but this.
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Check the View menu, make sure it's not in the full screen or presentation mode. There should be the corresponding items at the bottom of the menu to exit this mode.
If it's not the case, check the JDK version used to run IntelliJ IDEA (it should be the bundled JetBrains Runtime) and also check idea.log for possible exceptions: https://intellij-support.jetbrains.com/hc/articles/207241085.
Huh, well won't full and presentation mode hide the intellij menu bar? And I never installed a jre (this was a clean Ubuntu image installed this morning) so it has to be the intellij provided version. Now I've installed a jdk, might that be a possible cause?
No, it's unlikely. Might be screen menu issue, see:
https://youtrack.jetbrains.com/v2/issue/IDEA-168836
https://youtrack.jetbrains.com/v2/issue/IDEA-152207
Also try deleting IDE config directory to start with the defaults (https://intellij-support.jetbrains.com/hc/articles/206544519) and see if creating a new project helps.
Whoops... I'm sorry, this was a user malfunction. Turns out by default intiellij was coming up full screen and it didn't seem obvious to me where the window view controls were. Then I hovered over the application name in the top menu bar where I saw the controls appear.
Sorry for the run around.