Had the same problem. The problem seems to happen when installing ubuntu
on an already existing filesystem. In that situation, mkfs.ext4 will
prompt the user with:

/dev/sdc1 contains a ext4 file system
        last mounted on /boot on Sat Nov 14 06:38:38 2015
Proceed anyway? (y,n)

And ubiquity will not answer this.  Kirsch's solution works great.

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https://bugs.launchpad.net/bugs/1443692

Title:
  [Kubuntu 15.04 beta] Failed to format ext4 partition in the
  installation

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