Ubuntu – Reboot and select proper boot device problem after installing ubuntu

bootgrub2usb

Hi I have a toshiba satellite laptop.
I recently decided to replace my os which used to be
Windows 10 with ubuntu, and used a USB key to store the
Linux installation, plugged it in, successfully installed
Ubuntu and erased windows(as it says). After the installation
A message popped up telling my restart the computer in order to
Start using the new os. After doing so I get his blank screen
With the message:

Reboot and select proper boot device
Or insert boot media in selected boot device and press a key
Can't access anything now, btw I did enter to BIOS and set everything back
On default after the installation of the Linux and it still doesn't work
Can anybody tell me what can I do?

Best Answer

I think you have the same problem as mine, go to BIOS and go to security.
Navigate to Select Trusted file for booting.
HDD0(If you have one harddrive)
ubuntu(I don't remember the exact order, but look for these files)
EFI(I'm positive that it is EFI>>>Shimx)
Shimx(I don't know what it is called but it looks like Shimx or Shimax something like that)
Press enter
Call it ubuntu enter enter again
F10
This should help!