Unable to boot into linux

[Twilight]

I have an external hard drive which contain linux(ubuntu) system which boots in other laptop. But in asus tuf a15 it doesnt show the option to boot into my hard drive. I have tried "disabling fast boot and secure boot" but there is no option to boot into my external hard drive

[Twilight]

Twilight

I have an external hard drive which contain linux(ubuntu) system which boots in other laptop. But in asus tuf a15 it doesnt show the option to boot into my hard drive. I have tried "disabling fast boot and secure boot" but there is no option to boot into my external hard drive

Unable to boot into linux

somebody plz help

[Twilight]

@Titan_ASUS ,@Anders_ASUS plz help

[ASUS_Bot]

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