[Bug 1080701] Re: After 'Preparing to install Ubuntu' screen, raring installation hangs

[Tomás Arjovsky]

Had to deal with this problem installing Xubuntu 16.04. It happened on a
specific machine, but it was replicated with different USB sticks, with
different ISOs.

Previously, there was a 250 GB failing Xubuntu extended partition with a
root mount point and Swap, and a 10GB NTFS partition with backups.

What DID work for me:
What Codeslinger (#88) suggested and Dan Kegel (#122) confirmed: mounting another (not related at all) partition. In my case, I mounted the NTFS partition in /media/foo. When I reached "Preparing to install Ubuntu", a dialog appeared asking if I wanted to unmount it. I replied "No", and for the first time the installation dialog didn't freeze loading the next step. The rest of the installation was completely normal.

What did NOT work for me: 
- Deleting the previously failing Xubuntu extended partition. 
- Unselecting the "install updates" option.
- Unselecting the "install third party software" option.
- Changing language (I was installing it in spanish and thought maybe it was that, but it wasn't).

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Title:
  After 'Preparing to install Ubuntu' screen, raring installation hangs

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