Hello,
can you try the fix proposed in bug 129910 fixes the issue ? (basically, add 
fbcon to /etc/initramfs-tools/modules, run sudo update-initramfs -u, and reboot 
with vga=whatever). I think your issue might be caused by that bug
Cheers

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black screen or garbled graphics on boot
https://bugs.launchpad.net/bugs/102712
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