Whether your windows installation is 32-bit or 64-bit does not matter for Ubuntu since it's not dependent on windows. Do not get confused by the amd word in amd64, it's just a marketing name that refers to the same architecture: 64-bit (well, I may not be fully technically correct here, but you can expect an amd64 Ubuntu image to run on Intel machines). i386 is used for 32-bit stuff. If Wubi detects that you've a 64-bit capable processor, it downloads the 64-bit version.
If you really want to force the installation of a 32-bit image, see How do I force Wubi to download and install 32 bit version?
You're not using the latest version of wubi.exe. You have 12.04.1 instead of 12.04.2. It's release specific and that's part of the problem of why you're getting the development release. Also the same reason it rejects the ISO which is release 12.04.
When you first got the wubi.exe it was the current version at that time (12.04.1). But since then they've updated everything (for LTS releases they have 4 subsequent releases, each with a new version of wubi.exe) and now it's no longer valid and will only work offline with the 12.04.1 ISO.
Your ISO isn't 12.04.1 or 12.04.2, it's the original 12.04. And this is it rejecting the 12.04 ISO:
01-30 19:43 DEBUG Distro: parsing info from str=Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
01-30 19:43 DEBUG Distro: parsed info={'name': 'Ubuntu', 'subversion': 'Release', 'version': '12.04', 'build': '20120423', 'codename': 'Precise Pangolin', 'arch': 'i386'}
01-30 19:43 DEBUG Distro: wrong version: 12.04 != 12.04.1
And this is it not finding the diskimage (no longer available) and downloading the development release diskimage:
03-08 13:46 DEBUG TaskList: ### Running download...
03-08 13:46 DEBUG downloader: downloading http://releases.ubuntu.com/12.04.1/ubuntu-12.04.1-wubi-i386.tar.xz > D:\ubuntu\disks\ubuntu-12.04.1-wubi-i386.tar.xz
03-08 13:46 ERROR TaskList: [Errno 14] HTTP Error 404: Not Found
Traceback (most recent call last):
File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__
File "\lib\wubi\backends\common\downloader.py", line 77, in download
File "\lib\urlgrabber\grabber.py", line 927, in urlgrab
File "\lib\urlgrabber\grabber.py", line 845, in _retry
File "\lib\urlgrabber\grabber.py", line 913, in retryfunc
File "\lib\urlgrabber\grabber.py", line 1001, in __init__
File "\lib\urlgrabber\grabber.py", line 1072, in _do_open
File "\lib\urlgrabber\grabber.py", line 1182, in _make_request
URLGrabError: [Errno 14] HTTP Error 404: Not Found
03-08 13:46 ERROR TaskList: Non fatal error [Errno 14] HTTP Error 404: Not Found in task download
03-08 13:46 DEBUG TaskList: ### Finished download
03-08 13:46 DEBUG TaskList: New task download
03-08 13:46 DEBUG TaskList: ### Running download...
03-08 13:46 DEBUG downloader: downloading http://cdimage.ubuntu.com/wubi/current/i386.tar.xz > D:\ubuntu\disks\i386.tar.xz
03-08 13:46 DEBUG downloader: Download start filename=D:\ubuntu\disks\i386.tar.xz, url=http://cdimage.ubuntu.com/wubi/current/i386.tar.xz, basename=i386.tar.xz, length=576048376, text=None
03-08 14:02 DEBUG TaskList: ### Finished download
03-08 14:02 DEBUG downloader: download finished (read 576048376 bytes)
I'll still file the bug report, because it shouldn't download the dev release. But you need to redownload the latest wubi.exe from http://www.ubuntu.com/download/desktop/windows-installer
Best Answer
Actually, WUBI knows it better than you do. Toshiba Satellite A-215 S581 comes with the AMD Turion64 CPU, definitely a 64b processor.
You wouldn't be able to run the 64b OS on a 32b machine, but you are -- since you could run
uname -a.If you really want a choice, for whatever reason, then drop WUBI, install Ubuntu on a dedicated partition and use CD / USB stick image which you can choose to be 32b rather than 64b. In any case, what is wrong about having the 64b system?