Are you using Acer laptop?
I have exact the same key combination for BIOS and Boot select on my old /Acer Aspire.
I am using this laptop for dual booting Linux and Windows 10.
In general, it is preferable to Install Linux first followed by Windows, since Windows tends to think that it is the only OS exists on the system. If you search on the net you will find all sorts of horror stories about Windows overwrites itself on Linux bootloader made it un-bootable.
As for getting into BIOS, sometime the delay time which allows to hit function keys is set to very short. If that is the case, you really have to continuously tapping F2 key during booting.



