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I have multi-boot with Windows 7, Linux Mint, Kubuntu and then I was installing Ubuntu 11.10 too but during the installation it appears this message:

failed to unmount partitions. migration-assistant needs to mount a partition but cannot do so because the following mount point could not be unmounted: /dev/sda6. Please close any applications using these mount points...

What can I do?

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What is partition /dev/sda6 ? swap ? – bodhi.zazen Dec 18 '11 at 17:16
fdisk -l [provide the output] – shantanu Dec 29 '11 at 18:07

The obvious question is whether you closed any applications using these mount point; the usual suspects are a file manager or even the terminal, but anything can be using it.

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I had the same problem and found this advice.

You can install Ubuntu on your system by following steps:

  1. Boot your system with Ubuntu Live CD
  2. Select 'try Ubuntu'
  3. Open terminal and type sudo ubiquity --no-migration-assistant
  4. Follow with the installation window as usual.

This means you need to disable migration assistant, so you cannot import informations from user and Firefox in CentOS. That's all.

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