Mouse doesn't work in the guest OS (Ubuntu 14.04.2) on Virtual Box (installed on MAC OS X)

Solution 1:

... with an update to VBox 5.0.24 r108355 my "pointing device" setting in the "motherboard" tab changed to "USB tablet" ... I changed it back to PS/2 mouse and everything was fine again ...

host: windows 10 guest: ubuntu 14.04

Solution 2:

When people search for the issue mouse integration. In the 5.0.16 version there's a input menu. And there is the button mouse integration. Slightly differently placed than before... Otherwise another solution to 'SOLVE' the problem is to do this:

sudo nano /etc/default/grub

Then add psmouse.proto=imps to the boot parameters in the line GRUB_CMDLINE_LINUX_DEFAULT:

GRUB_CMDLINE_LINUX_DEFAULT="psmouse.proto=imps quiet nosplash"

Then hit CTRL+X to exit, then Y to save your changes. To update the setting:

sudo update-grub

And then reboot. This solution comes from this thread on Ubuntu Forums, credits: imrazor