Issue
My problem is that the content assist window won't pop up after clicking Ctrl + Space. I checked my shortcuts and the content assist is bound to Ctrl + Space. Sometimes the window automatically pops up making suggestion after typing dot e.g., but this won't happen when using the keys combination.
Eclipse version:
Eclipse Java EE IDE for Web Developers.
Version: Kepler Service Release 1 Build id: 20130919-0819
My OS is Ubuntu 12.04 if that matters.
Solution
I managed to fix it finally. The problem was that the ibus was overriding the shortcut so I deleted this shortcut configuration.
Type ibus in the dash:
Then select Keyboard Input Methods. From there click on the first three dots next to the Enable or disable textfield. This windows should appear: 
If there is something bound to Ctrl + Space simply delete it.
Answered By - Ivaylo Toskov
Answer Checked By - Pedro (JavaFixing Volunteer)
