I believe this is the initial problem:

Broken libharfbuzz0a:amd64 Casse on libharfbuzz0 [ amd64 ] <
0.9.16-0ubuntu1~12.10~ricotz0 > ( libs )

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https://bugs.launchpad.net/bugs/1263462

Title:
  System refuses to proceed the release upgrade due to third party
  software

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