install fails "backend object has no attribute "iso-path"

[palloy]

I downloaded Ubuntu 11.10 and put it on a USB stick.
I successfully installed it to HDD, messed about, crashed it, etc.
Now I am trying a clean install to SSD partition of 10 GB.
Everything went as before until the countdown clock reached zero, then I got
"Windows Backend object has no attribute 'iso-path' - see log for details.
It's done it three times now. (Formatting in between)

The end of the log says
======
11-01 17:20 DEBUG TaskList: New task check_iso
11-01 17:20 DEBUG TaskList: ### Running check_iso...
11-01 17:20 DEBUG CommonBackend: Checking Y:\ubuntu\install\installation.iso
11-01 17:20 DEBUG Distro: checking Ubuntu ISO Y:\ubuntu\install\installation.iso
11-01 17:20 DEBUG Distro: wrong size: 8094031872 > 900000000
11-01 17:20 DEBUG TaskList: ### Finished check_iso
11-01 17:20 ERROR TaskList: 'WindowsBackend' object has no attribute 'iso_path'
Traceback (most recent call last):
File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__
File "\lib\wubi\backends\common\backend.py", line 579, in get_iso
File "\lib\wubi\backends\common\backend.py", line 565, in use_iso
AttributeError: 'WindowsBackend' object has no attribute 'iso_path'
11-01 17:20 DEBUG TaskList: # Cancelling tasklist
11-01 17:20 DEBUG TaskList: # Finished tasklist
11-01 17:20 ERROR root: 'WindowsBackend' object has no attribute 'iso_path'
Traceback (most recent call last):
File "\lib\wubi\application.py", line 58, in run
File "\lib\wubi\application.py", line 130, in select_task
File "\lib\wubi\application.py", line 205, in run_cd_menu
File "\lib\wubi\application.py", line 120, in select_task
File "\lib\wubi\application.py", line 158, in run_installer
File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__
File "\lib\wubi\backends\common\backend.py", line 579, in get_iso
File "\lib\wubi\backends\common\backend.py", line 565, in use_iso
AttributeError: 'WindowsBackend' object has no attribute 'iso_path'
=======

Note the bit in red, 8 billion > 900 million.
The installation.iso is indeed 8 billion bytes, I imagine it is going to be root.disk isn't it. It is the 900 million that is wrong, should be 9 billion right ?

I've check the SSD partition for errors and its fine.

[bawbawbiscuit]

I have the same problem as well

[oneone687]

Me too I have same problem

[Rubi1200]

Common causes could be an interrupted download, failed md5sum, or bad burn to CD.


The easiest way to install Wubi is without burning anything. Just place the downloaded desktop CD ISO in your downloads folder along with Wubi.exe and run wubi.exe from there. Make sure you also remove any other CD's or USB's that contain Ubuntu from your computer as wubi will find them and use them instead. That includes ISO files saved in the root of any drive. (courtesy of forum member bcbc).