I have been using Virtualbox on Xubuntu in both headless and GUI mode, however, possibly after recent system updates, I cannot start GUI of virtualbox management window or a VM gui. Headless mode can report that a VM is running, and I can save, start, pause a VM, but it doesn't appear to be working properly as I should be able to interact with the headless VM but cannot.
System:
If i try to start virtualbox from command line, I get:Xubuntu - 16.04.4 LTS (GNU/Linux 4.10.0-42-generic x86_64)
Virtualbox - 5.1.34-dfsg-0ubuntu1.16.04.2
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screen 0 does not appear to be DRI2 capable
screen 0 does not appear to be DRI2 capable
Segmentation fault (core dumped)
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Qt FATAL: QXcbConnection: Could not connect to display
Any help much appreciated, thanks!