[Bug 1677034] Re: superfluous unmount prompts before installation, especially with grub isoboot

[Simon Quigley]

** Changed in: ubiquity (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1677034

Title:
  superfluous unmount prompts before installation, especially with grub
  isoboot

Status in ubiquity package in Ubuntu:
  Won't Fix

Bug description:
  [edit: Observed with Ubuntu 16.04.1 and .2 desktop amd64 ISOs]

  1. When using grub isoboot and the iso-scan boot parameter, the
  partition containing the ISO file is mounted at /isodevice and then
  /isodevice/.../ubuntu-whatever.iso is loopback-mounted at /cdrom.
  However, the graphical installer asks if the user wants to unmount it
  before starting the partitioner. If "no" is selected, the installation
  proceeds with no problem. I'm not sure what would happen if "yes," but
  presumably nothing good. We should recognize that /isodevice is a
  special/required mountpoint and not ask about it...

  2. I'm also prompted to unmount some random SD card that happened to
  be in my laptop (/dev/mmcblk0). It's irrelevant to the installation,
  so I don't think it matters whether I answer yes or no. Something
  mounted this automatically in the first place though; is there any
  good reason for that?

  Also, if #2 occurs, it is presented in the same dialog as #1. So there
  is no way to keep the required /isodevice filesystem *and* unmount the
  unrelated one (except at the command line).

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