You won’t be able to run any of the diagnostics because VirtualBox can’t remount the file systems as read only. If you don’t know to boot into safe mode in Ubuntu hold down the left-shift key. The first step in trying to fix this problem is to boot in safe mode. I also installed updates on my Windows 8.1 host (I know, I need to upgrade to Windows 10, it’s on the list) but I don’t think that had anything to do with the problem. The problem occurred after upgraded the Ubuntu 18.04 guest to kernel 4.15.0-52. It will either stay purple but sometimes goes black. The problem is my Ubuntu VM boots but freezes before getting to the login screen. This is the second time so I better write down what I did so I hopefully remember if it happens a third time. This issue happened to me many moons ago when I first upgraded to VirtualBox 6 and Ubuntu 18. Some notes so I remember how to fix this problem if it happens again and I don’t waste a bunch of time figuring it out right before a customer production release.
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