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Mouse stops working in Virtual Box after log in

After restarting my virtual machine I’m no longer able to use my mouse after login. The Guest OS (Ubuntu 18.04) captures the mouse (Host: Windows 10), but it can’t be moved and keys don’t appear to do anything.

I recently had to reinstall the guest installations (After updating Ubuntu it got wiped) and I suspect that it’s related. I’ve tried changing the mouse type (It’s currently USB tablet, the computer being used is a laptop) and removing the guest additions ISO. After doing that, the guest no longer captures the mouse.