BertN45, thanks for the clarification.
Given Oracle upstream has indicated on their website the root cause of this
issue is due to their Guest Additions version, and the fix is to upgrade only
the Guest Additions version, I'll reassign to virtualbox for review:
Potential solutions would be:
1) The virtualbox package in 18.04 is updated when Oracle provides the next
maintenance release of 5.2.x.
2) Update just virtualbox-guest-x11 to use 5.2.7 Guest Additions while keeping
all the other packages the same.
** Package changed: xorg (Ubuntu) => virtualbox (Ubuntu)
** Changed in: virtualbox (Ubuntu)
Status: Incomplete => Triaged
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