[Bug 292493] Re: usb startup disk failed to unmount /cdrom when change partition tables

[Matteo Pagliazzi]

This happens to me when I try to install Ubuntu 12.04 Beta 1 either with
a cd or with Unebootin

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Title:
  usb startup disk failed to unmount /cdrom when change partition tables

Status in “ubiquity” package in Ubuntu:
  Confirmed
Status in “usb-creator” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: usb-creator

  I created a USB startup disk and booted from it successfully. Then I
  clicked the "Install" icon to install Ubuntu 8.10. Everything went
  well: choose a locale, then choose a disk partition. Then a dialog box
  popped up and said:

  "The installer needs to commit changes to partition tables, but cannot
  do so because partitions on the following mount points could not be
  unmounted:

  /cdrom

  Please close any applications using these mount points.

  Would you like the installer to try to unmount these partitions again?

  [Go Back] [Continue]"

  Click either button will bring me back to the "Prepare disk space"
  step 4/7 stage, and then click Forward will pop up the same dialog
  box.

  I guess the installer needs to modify the partition tables but since
  /cdrom is mounted by the USB startup disk, it fails to proceed. How do
  I solve this?

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