Host is Mac OSX up to date, VirtualBox and guest additions up to date. Just installed Ubuntu mate 16.04 and ran the regular updates. I was doing other things waiting for the updates to run, so not sure when that happened but this is how I found the machine after a while. Has anyone ever seen that ? Restarted the machine and seems OK. 4GB mem, 3 CPU, 1 monitor, 128MB video mem, very strange. iso md5sum is correct.
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