[Bug 866006] [NEW] 11.10 beta2 Installer can't mount cdrom after language and locale steps

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I tried to install ubuntu-11.10-beta2-alternate-amd64+mac.iso. I burned this to cdrom. At boot time the cdrom was shown as WINDOWS and booted from it ( I thought there should also an EFI choice to boot from CD). 
The installer came up and I could choose language region and locale. 
After these steps the installer tries to mount the cdrom - but fails. I see only the Error message that it can't mount the cd-rom.
My hardware:
MacBook Pro
13-inch, Early 2011
Processor  2.7 GHz Intel Core i7

Serial-ATA:
Intel 6 Series Chipset:

  Vendor:	Intel
  Product:	6 Series Chipset
  Link Speed:	6 Gigabit
  Negotiated Link Speed:	1.5 Gigabit
  Description:	AHCI Version 1.30 Supported


MATSHITADVD-R   UJ-8A8:

  Capacity:	815.6 MB (815,612,448 bytes)
  Model:	MATSHITADVD-R   UJ-8A8                  
  Revision:	HA13    

  Native Command Queuing:	No
  Removable Media:	Yes
  Detachable Drive:	No
  BSD Name:	disk2
  Power Off:	Yes
  Async Notification:	No
  Partition Map Type:	Unknown
  S.M.A.R.T. status:	Not Supported

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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11.10 beta2 Installer can't mount cdrom after language and locale steps
https://bugs.launchpad.net/bugs/866006
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