I've made a few tests with the ubiquity installer in trusty-proposed in
Virtualbox (EFI mode not enabled).

* First I installed Windows 8 and left around 30 GB free.
* Then I installed Ubuntu to the free space using the automatic partitioning. 
All good! Windows was still there.
* Then I reinstalled Ubuntu. All good!
* After reboot, I ran the installer again to see what the "erase entire disk" 
option would do. The confirmation dialog reported that partitions 1 and 5 would 
be formatted, as expected (I didn't proceed).
* Then I went back and used manual partitioning to reinstall Ubuntu again. When 
making the first change, a message informed me that "the changes must be 
written to disk before continuing". That message is a bit alarming, but the 
installation worked correctly.
* Then I booted a Kubuntu live session to test the KDE frontend. This frontend 
didn't offer an option to replace Ubuntu with Kubuntu. It only had options to 
resize the Windows partition and install there, and to use the whole disk. So I 
used the manual partitioning. The confirmation dialog was displayed in this 
frontend too.
ubiquity-frontend-kde is in the "universe" repository, so it's not officially 
supported by Canonical, but I wanted to test it too.
* Finally, I formatted the Windows partitions with GParted and added a few 
files to them, then ran the installer to replace Kubuntu with Ubuntu (automatic 
partitioning). Everything worked as intended.
There was also an option to install Ubuntu alongside Kubuntu (by resizing one 
of the formatted Windows partitions). I tried it later: the confirmation dialog 
didn't mention those partitions being formatted. Then, during the installation 
I mounted those partitions (using "mount") and, as expected, they weren't 
formatted (I didn't have the time to finish the installation). So it seems to 
have worked correctly.

The confirmation dialog was always displayed (including after the manual
partitioning).

Every time before running the installer, I enabled trusty-proposed and upgraded 
3 packages: ubiquity, ubiquity-frontend-gtk, ubiquity-ubuntu-artwork (I wrote 
these names from memory).
I also wanted to see if ubiquity would detect an hibernated Windows 8 
partition, but I couldn't find the option to enable it in Windows 8 (maybe it's 
not supported inside Virtualbox).

ubiquity 2.18.8.3 seems to be working correctly from these not very
extensive tests in Virtualbox.

However, I haven't added the verification-done tag yet.
It would be great if someone else also tested this. Better yet if the tests 
could be done on a real UEFI testing machine.
But note that, according to https://wiki.ubuntu.com/TrustyTahr/ReleaseSchedule, 
14.04.2 will be released on February 5th. The new version of ubiquity should be 
tested and "approved" before then.

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https://bugs.launchpad.net/bugs/1265192

Title:
  Install/reinstall wipes out all/other partitions

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