The legacy VGA BIOS on your machine doesn't seem to support the same colour
depth as UEFI GOP does.
There isn't anything GRUB2 can do about this, and the menu is still displayed
"correctly" with just less colour depth.
As BIOS support is getting worse and worse on new machines, it is
recommended to use UEFI boot instead of CSM.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1570249
Title:
Braswell + UBUNTU 15.10 legacy mode , grub2 graphics interface
picture color distorted
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