The initial log contains the following:
[+2.89s] DEBUG: Launching process 888: /usr/bin/X -core :0 -seat seat0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+5.70s] DEBUG: Process 888 exited with return value 127

And the X log shows:
/usr/lib/xorg/Xorg: symbol lookup error: 
/var/lib/VBoxGuestAdditions/lib/libEGL.so.1: undefined symbol: RTR3InitDll

Does this always happen when the failure occurs?

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https://bugs.launchpad.net/bugs/1599775

Title:
  "low-graphics mode" in VirtualBox guest, but X server running

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