Unable to use mouse in other applications (including desktop) after launching Minecraft

[Notch8864]

Description: Ubuntu 16.04 LTS
Release: 16.04

default-jre:
  Installed: 2:1.8-56ubuntu2
  Candidate: 2:1.8-56ubuntu2
  Version table:
 *** 2:1.8-56ubuntu2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

I expected to be able to use my mouse in other applications, and not be forced to quit minecraft when I want to use another application.

But, whenever I launch minecraft (the game, not the launcher) I have found that I am unable to use my mouse in other applications while Minecraft (once again the game, not the launcher) unless I quit the game and either go back to launcher, or quit entirely, which I have found to be rather frustrating when I wish to vote for a server, because I end up needing to quit Minecraft, clicking the links and whatnot, then relaunch Minecraft, and all for nothing, I am not sure that it is actually the package default-jre, but that is the closest thing to what I know could be the problem.

[Notch8864 (winrt88)]

Changed the package name, as it was incorrect... Not sure why.