your dmesg shows the vbox crash, but Xorg log shows intel driver
crashing
** Package changed: xorg (Ubuntu) => xserver-xorg-video-intel (Ubuntu)
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1492880
Title:
Xorg crash
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