grub not loading with SHIFT after file modification

Question

Attempt to overcome blackscreen I ran the following steps

• created file /etc/grub.d/01_915resolution

• wrote the following lines into the file

echo insmod 915resolution echo 915resolution 58 1366 768 32

• then changed permission

chmod +x /etc/grub.d/01_915resolution

• Next I added resolution lines to the /etc/default/grub

GRUB_GFXMODE = 1366 x 768 x 32 sudo update-grub

I can now not get the Grub Menu when I hit shift.

How can I remove these changes ?

Thanks

Answer 1

Just:

• boot from a LiveCD, (or USB),
• delete the 01_915resolution file
• open the /media/ubuntu/ImpossibleLongNumber/etc/default/grub/ file in gedit
• remove the offending lines
• reboot