Is there any way to force grub menu to show it's content in external monitor (for selecting the os to boot on win or ubuntu), I use my laptop more like a desktop with a monitor connected to it because of broken laptop fan socket. Either HDMI or VGA would work.
Here is a bad way to do this, for most, that may just be good for you.
On desktop, open this file as root
gksu gedit /etc/default/grub
and find this line
and add a this to the end
my whole line is
so I would add it here
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=LVDS-1:d"
lvds-1 for you monitors name, if it is different, find it with
Save and exit, and run the command
This will disable the Laptop display for both
grub and the desktop and force it to the external display, even if you remove the
HDMI cable, the laptop screen will not work. You can remove the change to change it back to using the laptop screen.
I can't test this as I don't have a laptop, but I took it from an question at
arch, where the issue was no laptop display after forcing
grub to an external monitor.
I don't recommend this for most users who want there laptop to still be portable.