[Bug 1360048] [NEW] The "Go back" and "Continue" buttons do nothing when a partition is not correctly unmounted

[Elv13]

Public bug reported:

Step to reproduce:

1) mount a drive using the terminal, start to copy files on it
2) Install Ubuntu
3) When the parted dialog show and ask to unmount all drive, say "no"
4) Select the root partition and set "/"
5) It complain again for no valid reasons (ext4 -> ext4 for the same partition should _not_ change the partition table)
6) The timezone dialog show even if there was a "fatal" error.
7) A dialog ask to either force unmount or go back. Neither work

7.a) The "Go back" button does absolutly nothing
7.b) The "Continue" button start the installation, but it get stuck forever on "Detecting drives"

While this may not be the most common installation scenario, this bug
prevent Ubuntu from being installed and Ubiquity have to be X-killed.

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Screenshot"
   https://bugs.launchpad.net/bugs/1360048/+attachment/4184206/+files/Screenshot%20from%202014-08-21%2022%3A31%3A42.png

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https://bugs.launchpad.net/bugs/1360048

Title:
  The "Go back" and "Continue" buttons do nothing when a partition is
  not correctly unmounted

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  Step to reproduce:

  1) mount a drive using the terminal, start to copy files on it
  2) Install Ubuntu
  3) When the parted dialog show and ask to unmount all drive, say "no"
  4) Select the root partition and set "/"
  5) It complain again for no valid reasons (ext4 -> ext4 for the same partition should _not_ change the partition table)
  6) The timezone dialog show even if there was a "fatal" error.
  7) A dialog ask to either force unmount or go back. Neither work

  7.a) The "Go back" button does absolutly nothing
  7.b) The "Continue" button start the installation, but it get stuck forever on "Detecting drives"

  While this may not be the most common installation scenario, this bug
  prevent Ubuntu from being installed and Ubiquity have to be X-killed.

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