[Bug 1747228] Re: [18.04] You need at least 8.4 GB ... This computer has only 0.0 B.

[Simon Quigley]

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

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https://bugs.launchpad.net/bugs/1747228

Title:
  [18.04] You need at least 8.4 GB ... This computer has only 0.0 B.

Status in ubiquity package in Ubuntu:
  Won't Fix

Bug description:
  Testing the bionic daily desktop amd64 ISO for 2018-02-02 in a QEMU
  guest allocated 8GB via an LV, started in EFI mode and  using "Try
  Ubuntu" mode, when Ubiquity was started it reported:

  You need at least 8.4 GB disk space to install Ubuntu.

  This computer has only 0.0 B.

  I checked the LV was correctly connected:

  cat /sys/block/sda/size
  16777216

  I then expanded the LV to 16GB and re-ran the exercise and got the
  same message.

  cat /sys/block/sda/size
  33554432

  I did some hunting through the source code and discovered that when
  the prepare step calls ...

  /bin/parted_devices

  ... nothing is returned.

  I ran strace on that command.

  It turns out if the device is *read-only* nothing is returned.

  Ubiquity really should report something more appropriate. Currently
  the 0.0 message is due to the variable 'free' being initialised to 0
  and not being changed because parted_devices doesn't return any data.
  No results should provoke a helpful GUI message, and certainly
  something in the debug log.

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