wubi install fails near end

[AJF]

When I am trying to install Ubuntu using wubi, the installer fails every time with errors in the log file:
06-10 10:47 ERROR TaskList: [Errno 22] Invalid argument
Traceback (most recent call last):
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\backends\common\tasklist.py", line 196, in __call__
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\backends\common\utils.py", line 206, in copy_file
IOError: [Errno 22] Invalid argument
06-10 10:47 DEBUG TaskList: # Cancelling tasklist
06-10 10:47 ERROR root: [Errno 22] Invalid argument
Traceback (most recent call last):
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\application.py", line 55, in run
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\application.py", line 125, in select_task
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\application.py", line 193, in run_cd_menu
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\application.py", line 117, in select_task
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\application.py", line 155, in run_installer
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\frontends\win32\frontend.py", line 137, in run_tasks
IOError: [Errno 22] Invalid argument
06-10 10:47 DEBUG TaskList: New task check_iso
06-10 10:47 DEBUG CommonBackend: Searching for local ISO
06-10 10:47 DEBUG CommonBackend: Could not find any ISO or CD, downloading one now
06-10 10:47 DEBUG TaskList: New task get_metalink
06-10 10:47 ERROR TaskList: Cannot download the metalink and therefore the ISO
Traceback (most recent call last):
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\backends\common\tasklist.py", line 196, in __call__
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\backends\common\backend.py", line 482, in get_iso
  File "Z:\home\evan\bzr\wubi.trunk\build\wubi\files\lib\wubi\backends\common\backend.py", line 326, in download_iso
Exception: Cannot download the metalink and therefore the ISO
06-10 10:47 DEBUG TaskList: # Cancelling tasklist
06-10 10:47 DEBUG TaskList: # Finished tasklist

I am using Windows XP SP3 1GB RAM 80GB HDD

[Agostino Russo (ago)]

Use the ISO directly, not the CD.

[linfidel (linfidel)]

I had the exact same problem. The computer will boot from the CD and run, but will not install wubi. How can this not be considered a problem? What's the point of including this feature if it will not work? Simply to waste people's time, including your own? I don't think so.

And what kind of answer is "use the ISO directly, not the CD"? That makes absolutely no sense in this context.

I checked bug #207137, and I don't see much similarity, other than a failure to install. If this is similar, I guess every bug should be a duplicate, as they are all failures of some sort.