@ Evan Dandrea,

I just tried two more installs , using ubiquity version 2.3.13, details
below:

I began with another entire disc install, beginning with only one drive
installed:

ubu...@ubuntu:~$ sudo parted /dev/sda print
Model: ATA WDC WD800JB-00JJ (scsi)
Disk /dev/sda: 80.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type      File system     Flags
 1      1049kB  25.4GB  25.4GB  primary   ext4            boot
 2      25.4GB  80.0GB  54.7GB  extended
 6      25.4GB  50.1GB  24.7GB  logical   ext4
 8      50.1GB  73.5GB  23.4GB  logical   ext4
 9      73.5GB  74.6GB  1061MB  logical   linux-swap(v1)
 7      74.6GB  76.7GB  2142MB  logical   linux-swap(v1)
 5      76.7GB  80.0GB  3305MB  logical   linux-swap(v1)

After choosing the "Erase and use entire disc" option I'm taken to a
screen that shows "Allocate drive space" and I see the graphic "Ubuntu
/dev/sda (ext4) 0.0B" with the two options "Use entire partition" or
"Split largest partition". Since I'd already selected the "entire disc"
option why is it even asking me those two questions? Which partition?
I've already chosen to "Erase and use entire disc" so why ask if I want
to split a partition?

Also the "use the advanced partitioning tool" option was NOT available!

I clicked on neither one of those options. I just clicked on "Install
now".

It did install properly (I rebooted to be sure):

la...@lance-desktop:~$ sudo parted /dev/sda print
Model: ATA WDC WD800JB-00JJ (scsi)
Disk /dev/sda: 80.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type      File system     Flags
 1      1049kB  76.7GB  76.7GB  primary   ext4            boot
 2      76.7GB  80.0GB  3305MB  extended
 5      76.7GB  80.0GB  3305MB  logical   linux-swap(v1)

But I can easily see how this would be very confusing,

Next I went for a "side by side" install on that same drive. I made no
changes to the partitions before beginning. After clicking on "Install
side by side choosing between...." I go to a screen that this time shows
the partitions properly. It showed 37.8GB and 38GB, and it showed one
smaller partition hidden (obviously SWAP) along with the option to use
the advanced partitioning tool. And the "slider" works to change
partition size.

But it also shows the options to "Use entire partition" or "Use entire
disc". Need I explain the potential confusion surrounding that? Which
partition are they referring to? Which disc? Remember that Windows users
are used to thinking "A", "C", "D", etc. Many don't know the difference
between a disc and a partition because Windows keeps us "dumbed down"
:^)

However I simply bypassed those options again, clicked on "Install now",
and the install was successful:

ubu...@ubuntu:~$ sudo parted /dev/sda print
Model: ATA WDC WD800JB-00JJ (scsi)
Disk /dev/sda: 80.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type      File system     Flags
 1      1049kB  38.7GB  38.7GB  primary   ext4            boot
 2      38.7GB  80.0GB  41.3GB  extended
 6      38.7GB  75.1GB  36.4GB  logical   ext4
 7      75.1GB  76.7GB  1605MB  logical   linux-swap(v1)
 5      76.7GB  80.0GB  3305MB  logical   linux-swap(v1)


I wish I could come up with some consistent pattern here but I've been testing 
with both 2.3.12 and 2.3.13 the past two days and I can not find a consistent 
behavior :^(

I'd first thought it had to do with the number of partitions but I've
now tried it enough to know that's not the case.

The problem is also not just limited to this "misreading" of
drive/partition size. Improper (or poorly described) options are offered
after making an initial selection.

So, I'm thinking this at least needs a mention in the release notes but
the behavior is so inconsistent I have no idea what a person could say.
I very much fear what will happen with Win 7 users because many OEM
installs have 3 existing partitions (one tiny one with part of the boot
files, another with sys utility, and the big one with the actual OS).

This scares me big time. Even for a Beta!

I'm quite tired so if this makes very little sense please accept my
apologies in advance, and hang in there ;^)

I certainly don't envy the situation this change puts you in.

-- 
During install reports size of new partition as 0.0 B
https://bugs.launchpad.net/bugs/626299
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