I believe I have a workaround to this. I had exactly the same on 17.10
on an Acer Aspire One, reinstalled 16.04 and still had it. I also had it
clear up if the machine suspended and resumed.

It looked to me like it was related to the grub splash screen, just
based on it messing up before the GUI starts and the portion of the
screen that got corrupted.

I changed the grub config in /etc/default/grub to the following...

GRUB_CMDLINE_LINUX_DEFAULT="" <- edit the existing line
GRUB_GFXPAYLOAD_LINUX=text <- add this line

Then updated grub with sudo update-grub and rebooted.

Now it has a 100% text boot and no corruption of the screen.

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https://bugs.launchpad.net/bugs/1728565

Title:
  Desktop (screen) corrupted after upgrade to 17.10

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