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Hello !

I tried booting from my external hard drive (with a linux os on it) but I can't.

The hard drive booting option never shows, when I go to the boot menu (esc + f9) i don't have the option to boot from it. 

In the bios menu (f10)  I tried disabling secure boot, usb is already enabled. I tried prioritising usb boot by changing the boot order. But still nothing.

This hard drive is used on another laptop with window also and I don't have any issue booting from it by selecting it in the boot menu, so why can't I do the same on my HP laptop ?

Is it because of grub loader ? I have a gpt partition on my hard drive with ubuntu so it should start no ?

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