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Re: Is it possible to install Debian in such a case.

Le 10/05/2019 à 10:48, An Liu a écrit :

What I Have.
a USB stick with
1.  a portable GRUB (either UEFI or legacy)
2.  a install ISO, such as debian-9.9.0-amd64-DVD-1.iso (mayb would e
a LiveCD make life easier?)

What we want.Have Debian installed (could assume that we could do
whatever we could, such as re-partitation the whole harddisk)

Do you want to put the Debian installer on the USB stick and be able to install a Debian system from it into another location, or install a Debian system on the USB stick ?

The work around is to boot with  vmliunz and initrd.gz from
the cost is very small as these two file size total is less than 20M

Downloading vmlinuz is not required. You can get it from the ISO image.

I wonder if there is a way to finish install only in GRUB, without
initrd involved

The initrd.gz included in Debian installer ISO images cannot read files from an ISO image, only from a plain drive or partition. This is why you need an initrd.gz for hd-media. Note that there may also be restrictions about the supported filesystem types containing the ISO image.

Things may be different with Debian live images.