I have installed windows 10 on uefi boot, now I want to install ubuntu alongside windows. The problem is that when i open boot manager computer cannot find ubuntu usb, but when i plug windows usb boot manager finds it. If i install everything on legacy then boot manager finds my ubuntu usb but when do ubuntu installation there is no option for “install ubuntu alongside windows 10”. Where could be a problem?
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Are you sure that the USB containing Ubuntu is bootable? I'd highly recommend following this tutorial since it is the recommended way of executing this process.
Once you've done that and the problem still occurs, then the boot order in your BIOS is probably incorrect. Therefore, you need to adjust the boot sequence priority in your BIOS. Go into your BIOS setup and select the BOOT tab. Afterwards, move the USB containing the Ubuntu image on top, thus giving it the highest priority on boot.
Hope this helps. Good luck.
