There was no release since this commit so the only option is to wait for it.
I assume there is no way that xserver-xorg-core package maintainer (Ubuntu) will apply this patch before the release.
Temporary workaround is to disable VBox mouse integration.
This bug is connected with X11.
Probably this commit fixes the problem:
http:// cgit.freedeskto p.org/xorg/ xserver/ commit/ ?id=3d1051aecbb 1955084804133ca cd12c7f696833a
There was no release since this commit so the only option is to wait for it.
I assume there is no way that xserver-xorg-core package maintainer (Ubuntu) will apply this patch before the release.
Temporary workaround is to disable VBox mouse integration.