Public bug reported:

Binary package hint: ubiquity

The following applies when installing a fresh copy of ubuntu using
manual partition selection where some partitions are not formatted (for
example /home partition). When the some partitions that is not to be
formatted is recognised but not mountable (due to unclean unmount, etc.)
other partitions that come first in the partition list, like the target
root partition, might get formatted before the installer sees the other
partition is not mountable. The installer than stops because an error
occurs and might leave the system in an unbootable state (as the target
root could be the same as the old root).

In my case this was resolved by running fsck manually, but i can imagine
there are cases where this does not work.

To make this more robust I suggest the following:
- check if partitions that need no formatting can be mounted before formatting 
other partitions
- if this fails, ask to run fsck which might resolve it

When these both fail, the other partitions are not touched which might
leave the system in a bootable state which would otherwise not be the
case.

Maybe this can be a part of the 'hardy-ubiquity-reliability' blueprint for 
hardy:
https://blueprints.launchpad.net/ubuntu/+spec/hardy-ubiquity-reliability
---
Harry de Boer

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

-- 
Partitioning sequence in livecd installer (ubiquity)
https://bugs.launchpad.net/bugs/164865
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