That's a new kernel and could be related. You could try the new Linux-libre kernels from e.g. http://jxself.org/linux-libre/

uname -r will show you what kernel you're running now. Holding shift at boot should show you the grub menu where you can select which kernel you want to boot. I believe the latest is the default. (or perhaps whichever latest installed)

ps. virtualbox is going away in Trisquel 7 so you might want to look at the alternatives.

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