Fixing Grub in UEFI mode

Boot Repair never worked for me. Despite the dual boot, Windows booted every time and so I had a workaround using Escape key and following up Boot Options from there which was always an inconvenience. Another temporary fix had to be repeated. So the permanent that has been successful is discussed ahead.

Using terminal:

gksu gedit /etc/default/grub

In this file, find the line:

GRUB_CMDLINE_LINUX=""

Edit this line to look like:

GRUB_CMDLINE_LINUX="acpi_backlight=vendor nouveau.modeset=1"

Save the file and issue a final command to flush the new changes:

sudo grub-mkconfig -o /boot/grub/grub.cfg

Reboot and enjoy!

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