The same problem happened to me with xubuntu-9.04-alternate-i386.
Apparently  pata_opti  kernel module(s) is(are) missing.
My suggestion to Ubuntu developpers is to add pata_opti module(s) to
the alternate variant.

Until then, here is a solution that worked for me.

+ On a 'healthy' Ubuntu 9.04 jaunty system, find:

  $ pwd; ls -l pata_opti*; cksum pata_opti*
  /lib/modules/2.6.28-11-generic/kernel/drivers/ata
  -rw-r--r-- 1 root root 15224 2009-04-17 06:41 pata_opti.ko
  -rw-r--r-- 1 root root 17880 2009-04-17 06:41 pata_optidma.ko
  1955373515 17880 pata_optidma.ko
  2254948007 15224 pata_opti.ko

  These can also be accessed on a LiveCD running system.

+ Copy these 2 files onto a USB memory stick.

+ Plug the USB stick to the box, being installed with
  {,X,K,G,L,?}Ubuntu-?.??-alternate-*

+ When the message "No common CD-ROM drive was detected" appears,
  hit 'Alt-F2' to get into a terminal shell.

+ Mount the USB partition. For example:
    # mkdir /tmp/sda1;  
    # mount /dev/sda1 /tmp/sda1
  Or find the right device by browsing /var/log/syslog.

+ Load the modules. For example:
    # cd /tmp/sda1
    # insmod pata_opti.ko
    # insmod pata_optidma.ko   # This may not be necesary ??

+ Optionally, you may umount the USB partition - 
    # cd /;  umount /tmp/sda1

+ Go back to the installation view, by hitting Alt-F1.
  Proceed with 'Continue' and when prompted to enter CDROM device, enter:
    /dev/sr0

For me it worked, the CDROM was well recognized and the installation
continued.

I do have other unrelated grub-install problems. But this is a separate
story.

-- 
No common CD-ROM drive was detected.
https://bugs.launchpad.net/bugs/195614
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