I was trying to change my boot device on Ubuntu but when I hold F2 [the key to enter my BIOS] Ubuntu GNU GRUB appear. I would like to know how to enter my BIOS so I can continue changing my boot device.
You should not press and hold, you need to press it repeatedly until the BIOS shows up on the screen.
If that does not happen F2 is not the right key for your system (it depends on the maker and model of your computer).
For those that might still stumble on this problem, the solution is:
When you start your PC, hold ESC, or you can hold ESC and then start the PC, doesn't matter.
A menu will appear. From there you can select which device to boot or to go into BIOS.
If you are to boot from a dvd or usb you can press 'c' at grub menu for a console then type exit and hit enter. It will boot on your dvd or usb. I was completely mad with this issue until I found this workaround.
This problem might be caused by the fact that one has
acpi=off option in your grub.
To fix it:
GRUB_CMDLINE_LINUX_DEFAULT variable value from
quiet splash acpi=off to
quiet splash reboot=bios in your
then please do
Now you will be able to enter bios
However to make Ubuntu bootable again after you've change everything you needed in BIOS you should state
quiet splash acpi=off in grub boot option (to enter it from GNU GRUB menu just navigate to your boot option (I guess it is Ubuntu) and press e)