You can try the following via the command line:
sudo nano /etc/usplash.config
make it look like
# Usplash configuration file
xres=1024
yres=768
save and close, then type
sudo update-initramfs -u
reboot and see if that fixes it.
** Changed in: usplash (Ubuntu)
Importance: Undecided => Low
Status: Unconfirmed => Needs Info
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usplash: No usable theme found for 640x480
https://launchpad.net/bugs/63686
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