[Bug 995335] [NEW] ubiquity installer should show summary screen before performing destructive operations

[James Hunt]

Public bug reported:

Talking to Evan, apparently the installer used to show a summary screen.
After a few observed issues this cycle (for example, bug 684309 and bug
813134), I think it makes sense to re-add the summary screen before the
installer makes any destructive changes to the disk(s).

By providing a summary screen, the user is given a final chance to abort
the install if they disagree with the heuristically determined installer
strategy.

This summary screen should be displayed by default such that the user
must click "yes"/"next" to accept the changes. This screen should also
present a "go back" button to allow the user to make other choices.

The summary screen ideally would display both the existing disk layout
and the proposed disk layout, for the latter showing:

- which partitions are to be reformatted
- which FS type each partition will become
- which disk the bootloader will be installed to

I feel that users would much rather be presented with a summary than
have the possibility of data loss (perfect example of where the
Principle of Least Surprise should apply I think :-)

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

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https://bugs.launchpad.net/bugs/995335

Title:
  ubiquity installer should show summary screen before performing
  destructive operations

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  Talking to Evan, apparently the installer used to show a summary
  screen. After a few observed issues this cycle (for example, bug
  684309 and bug 813134), I think it makes sense to re-add the summary
  screen before the installer makes any destructive changes to the
  disk(s).

  By providing a summary screen, the user is given a final chance to
  abort the install if they disagree with the heuristically determined
  installer strategy.

  This summary screen should be displayed by default such that the user
  must click "yes"/"next" to accept the changes. This screen should also
  present a "go back" button to allow the user to make other choices.

  The summary screen ideally would display both the existing disk layout
  and the proposed disk layout, for the latter showing:

  - which partitions are to be reformatted
  - which FS type each partition will become
  - which disk the bootloader will be installed to

  I feel that users would much rather be presented with a summary than
  have the possibility of data loss (perfect example of where the
  Principle of Least Surprise should apply I think :-)

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