Host: macOS 10.14.6 "Mojave" with 2.7 GHz Intel Core i7, 16 GB RAM, and 1536 MB VRAM. I'm on a 15" MacBook Pro with Retina Display.
Guest: Linux Mint 18.1 Serena (32-bit) with 1.5 GB RAM and 128 MB VRAM, and the graphics adapter is VMSVGA with 3D acceleration enabled. The kernel version is 4.4.0-53-generic.
Retracing my steps, I just updated to the latest version of VirtualBox, saw the resolution of the Linux screen was too big, so I changed Virtual Screen 1 to scale to 175%. Things were fine. I upgraded the packages in the Linux Mint guest with
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sudo apt-get update
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sudo apt-get dist-upgrade
I tried updating and upgrading packages again, running
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sudo rcvboxadd setup
Other interesting things: 1) This happens whether I log in to Xfce or in Cinnamon. 2) Before, the login screen on Linux Mint was always scaled down, but everything worked as they should once I log in to a desktop environment. Now everything is scaled down. 3) Every once in a while, the machine aborts. I never had that happen before either, and I can't find a pattern as to why it happens.
I left the machine at 200% autoscaled output, with the display settings in Xfce set to 1280x756 by the time I gave up.
I got a log from cold booting all the way until the problem manifests itself, then shutting down softly.
Can you please help me? I have no idea what to do at this point.