** Description changed:

  The issue i'm having is with the initial installation.
  
  I run Windows XP Home Edition on an HP Pavilion a656x with an added
  video card and an added stick of memory. It has two optical drives,
  drive E (a DVD/CD drive) and drive F (a CD drive).
  
  Here is what happens...
  
  1. I boot into Windows XP
  2. I insert the Ubuntu 9.04 CD into drive E
  3. I get a pop-up message window (from pyrun.exe) telling me that there is no 
disk in drive F
  4. My options are Cancel, Try Again, and Continue and the "X" to close the 
little window
  5. no matter what i click, the error message just pops back up.
  
  if I put the CD in the Drive F, then everything happens exactly the same
  except that in step 3, the message informs me there is no disk in drive
  E.
  
  So, whichever of my two drives i insert the CD into, the installer
  complains that i don't have a disk in the OTHER drive.
  
  In Ubuntu 8.10 (which I no longer have installed on my system), after I
  inserted the CD, I would simply get a pop-up that presented 3
  installation options (and I want to choose the 2nd one: install inside
  windows)....in Ubuntu 9.04, if i keep clicking the various buttons
  randomly like 50 times (Cancel, Try Again, Continue, and the little
  close "X")...I will eventually get the installation options.
  
  ---------------------------------
  
  UPDATE:
  I am the author of this bug report, which I reported in april 2009. It is now 
January 2010, and I have decided to sum up the issue and the work around so 
people won't read the first 5 or 6 posts and misunderstand the issue.  I am 
still getting email notifications; so, apparently this is still a problem.
  
  APPARENT CAUSE:
  This issue appears to be due to the wubi installer being ported to python 
from its original language; therefore, if i remember correctly, this problem 
will only be seen on wubi 9.04 and later. Wubi (and possibly python itself) has 
problems dealing elegantly with empty data storage devices in certain 
instances. Wubi scans all drives on your system a certain number of times 
during the installation process. Every time it scans through the drives and 
encounters one it does not know how to deal with, it produces this error. If 
you click through it, wubi moves on to the next drive.
  
  WHAT TO EXPECT:
- It feels like an infinite loop or like ubuntu messed up Windows somehow. But, 
it is nothing so serious. Wubi scans the through all drives several times 
during the installation process and produces this error message any time it 
encounters a drive it doesn't understand. If you click the error message, wubi 
simply scans the next drive.
+ It feels like an infinite loop or like windows must be rebooted, but, it is 
nothing so serious. Wubi scans the through all drives several times during the 
installation process and produces this error message any time it encounters a 
drive it doesn't understand. If you click the error message, wubi simply scans 
the next drive. If you keep clicking through the error message, wubi will 
eventually have scanned all the drives and move on.
  
  For example, my computer had a card reader with 4 slots. Each slot was
  considered a drive and each slot produced an error. Wubi scanned my
  drives 3 times during the installation, so I had to click through the
  error message a total of 12 times.
- 
  
  POSSIBLE PROBLEM DEVICES:
  - card readers (usually each slot will produce the error)
  - empty CD or DVD drives (not all people experience issues with these...my CD 
and DVD drive did not produce any errors)
  - virtual drives
  - drives assigned non-ascii drive letter
  
  MORE ABOUT DEVICES:
  - built-in card readers appear to be the most commonly reported problem device
  - on the ubuntu forums, I have read that someone had this issue due to an 
attached cell phone
  - some printers, keyboards, or monitors can have a built-in card 
reader...don't forget to check that
  
  WORKAROUND (TEMPORARY SOLUTION):
  1. Eject the problem devices, OR...
  2. Click through the error messages -- it is not an infinite loop, you will 
get one error message per problem device each time wubi scans the drives.

-- 
wubi installer's pyrun.exe says "no disk"
https://bugs.launchpad.net/bugs/365881
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