Ubuntu – How start ubuntu from a bootable USB stick

bootsystem-installationusb

I made a bootable USB stick and I made sure to follow the guide lines. As far as I can tell nothing went wrong when creating the USB stick but somehow I can't find out how to boot ubuntu from the stick. I tried restarting my laptop as guide lines suggest but it only starts Windows again. Any ideas what I'm doing wrong?

Best Answer

It looks like something not set correctly in BIOS. So first go to the BIOS (look which Fxx key is the "BIOS-entry" key on your model of computer) and look around. There may be Allow USB boot option somewhere. If there is -> enable it. Than search for Boot order menu. You should set the "boot from USB" before "boot from HD". Make sure that you have the bootable USB pluged in before entering to BIOS. My machine for example, didn't give me "boot from USB" option if there was no bootable USB plugged in. If you see somewhere Fast boot option (or similar) -> disable it. You can also set the BIOS to Legacy mode.

Hope you get it working!

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Create UEFI Bootable USB Stick for Windows and Ubuntu Installation

For EFI booting move all MS content under /EFI to another folder, call it /EFI.ms for example, with BOOT and Microsoft subfolders; this is to disallow certain UEFI firmwares to force boot Windows when they see it. Now under the EFI folder copy the BOOT and Ubuntu folders created for your bootable stick. Under /EFI/Ubuntu append this menu entry to the file grub.cfg you'll find there:

menuentry "Windows 8.1 EFI Setup" {
    insmod ntfs
    chainloader /EFI.ms/Microsoft/Boot/bootmgfw.efi
    boot    
}

Make sure you know which folder is which in case your Ubuntu files got replaced after you added the Windows image, I mean the /EFI/BOOT folder; it may contain two files for Ubuntu, bootx64.efi and grubx64.efi; those come from /EFI/Ubuntu folder, I think bootx64.efi is copied from shimx64.efi.

For MBR style booting from the same USB stick, append this entry to the txt.cfg file under /isolinux:

label w81
    menu label ^Setup Windows 8.1
    COM32 chain.c32
    APPEND fs ntldr=/bootmgr

Best Answer

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Create UEFI Bootable USB Stick for Windows and Ubuntu Installation

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