If you don't feel like dd'ing iso images into usb keys, then maybe read on..
Download iso images and start the admin panel. The script will find *.iso files and will let you mount it. It will also update boot menu
If you have more than one Raspberry Pi or Debian/Ubuntu, install auto-apt-proxy on every machine, which auto finds and connects to installed apt-cacher-ng server. If you reinstall or download packages on multiple hosts this will save you bandwidth and speed up installations.
GUI to download Debian/Ubuntu - this must be the easiest way to install! No need to download full or minimal netinst iso images, no need to run md5/sha sum checks. Only the first install is slower, following installs will be lightning if using apt-cacher-ng
Define locale/packages in admin/config.php autoinstall with preseed.cnf soon
Can Live boot Debian and Ubuntu via NFS, can boot windows 10 setup