[Bug 2024332] Re: Warn if the installation source device is selected as installation target

[David Hedlund]

** Attachment added: "1-2.jpg"
   https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/2024332/+attachment/5680601/+files/1-2.jpg

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Title:
  Warn if the installation source device is selected as installation
  target

Status in subiquity package in Ubuntu:
  New

Bug description:
  Traditional ISO installation tools could install only on USB flash
  drives. However, balenaEtcher, and Ventoy, can also install ISO on
  internal hard disk drives.

  The benefit of installing from internal hard disk drives is that they:

  * can always be mounted in the computer, so they will always be
  accessible

  * they are faster than USB flash drives. Even the fastest USB flash
  drives are using compact internal hard disk drives like NVMe M.2.

  #################
  Issue

  The issue is that subiquity still is designed for USB flash drives,
  which means that they will not add a warning text next to the title
  for internal hard disk drives even if they are used as installation
  medium.

  See Bug attachments "1-3-proposed.jpg", and "2-2-proposed.jpg", the
  red text "[installation source]" is the proposed text that I added
  with text manipulation software to make my idea clear.

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