Ubuntu 20.04 LTS (Focal Fossa) Server

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Link:- https://releases.ubuntu.com/20.04/ubuntu-20.04-live-server-amd64.iso

Ubuntu 20.04 LTS (Focal Fossa) Desktop Guide

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Link:- https://wiki.ubuntu.com/FocalFossa/ReleaseNotes?_ga=2.53954464.940674289.1588421111-1178322608.1583653023

Ubuntu 20.04 LTS (Focal Fossa) Desktop

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Link:- https://mirrors.melbourne.co.uk/ubuntu-releases/20.04/ubuntu-20.04-desktop-amd64.iso

Scientific Linux 7

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Link: http://ftp1.scientificlinux.org/linux/scientific/7x/x86_64/iso/SL-7-DVD-x86_64-2015-04-07-7.1.iso