Conduct user testing of the full installation assistant

Originally created by @sajolida on #8589 (Redmine)

Around 1h30 per user.

                    min    ideal
- Debian graphic    2
- Ubuntu graphic    2
- Debian hacker     2
- Mac               2      4
- Windows           2      3
  different versions
- Clone             2
- Upgrade           2
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Attachments

• ux-testing-20151120.ods

Parent Task: #8580 (closed)

Subtasks

• #10101 (closed)
• #10102 (closed)
• #10508 (closed)

Related issues

• Related to #12717 (closed)
• Blocks #8590 (closed)
• Blocked by #9310 (closed)