The computer didn't automatically boot from USB, [duplicate]

I am new in Ubuntu and created a bootable USB disk first and restarted the PC(with OS Windows8) as recommended in the tutorial. However, the computer didn't automatically boot from USB, no menu box appeared on screen to choose "Try Ubuntu" or "Install Ubuntu", even though I tried holding esc, F12, F10. I appreciate any help!

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2 Answers

This article has detailed steps for creating Ubuntu 18.04 Live USB and booting it:

The part you are stuck on now is getting BIOS to boot the Live USB:

Access Boot Menu

To access Boot Menu on your computer you will need to hit different keys (or combination of keys) depending on your computer type. Here is the list of possible keys you may have to press depending on your PC:

Device	Key Combination	Comment
Acer	Esc, F12 or F9	F12 key most likely
Apple	⌥	the key is also known as Option or Alt
Asus	F8 or Esc
Compaq	Esc or F9
Dell	F12
eMachines	F12
Fujitsu	F12
HP	Esc or F9
Lenovo	F8, F10 or F12	Other possibilities: Novo button or Fn + F11
Samsung	Esc or F2 or F12	For ultrabooks from Samsung disable the fast boot option in BIOS/UEFI. See next section.
VAIO	Esc, F10 or F11	Other possibilities: Assist button
Toshiba	F12

These are the keys to override the boot priority for a single session. There are other keys for accessing the full BIOS/UEFI menus below.

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Access BIOS/UEFI

To access BIOS/UEFI on your computer you will also need to hit different keys (or combination of keys) depending on your computer type. Here is the list of possible keys you may have to press depending on your PC:

_{Key combinations for accessing BIOS/UEFI Device}

Device	Key Combination	Comment
Acer	Del or F2	F2 key most likely
Asus	Delet or Del
Compaq	F10
Dell	F2
eMachines	Tab or Del
Fujitsu	F2
HP	Esc, F10, F11	Other possibilities: on Pavilion - F1
Lenovo	F1 or F2	Other possibilities: small button next to the Power button (if laptop)
Samsung	F2	For ultrabooks from Samsung if might be F10
VAIO	F1, F2, F3	Other possibilities: Assist button
Toshiba	F1, F2, F12 or Esc

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Have you changed your boot priority in the BIOS? I think you can find the settings you want by changing the priority in the BIOS.

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