What to do if Bios does not open?

Question

BIOS

Hello! I can't open BIOS on Toshiba Satellite L735 laptop. Tried probably all the keys and keyboard shortcuts. I did not find information on the Internet. I wrote to Toshiba technical support - they sent me to the service.
The fact is that the laptop originally had Windows 7, at that time there was also a boot screen on which the key to enter Bios was written.

Now I have Ubuntu, and there is no boot screen.
What can be done? How to act? I will be glad for your help.

Answer 1

what launches F2