How to install Ubuntu version 19.10 on a external HDD or SDD directly from a Ubuntu machine/system with 19.10 without a bootable USB drive?

I have a ubuntu system on my main pc with the version 19.10 installed. I have previosly installed Ubuntu or other linux distros various times in the past and I am pretty accustomed to the installing process. I am wondering if it is possible or there is an official software or any other tool to…

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