$ grep liblaunchpad-integration 
../simple/precise/ubuntu-12.04-alternate-amd64.list 
/pool/main/l/launchpad-integration/liblaunchpad-integration-3.0-1_0.1.56_amd64.deb
/pool/main/l/launchpad-integration/liblaunchpad-integration-common_0.1.56_all.deb
$

liblaunchpad-integration1 isn't present on the alternate CD, so the
version seen here is the one from lucid which has a Breaks: from
liblaunchpad-integration-common.

Looking more closely at what wants liblaunchpad-integration1:

  Installing liblaunchpad-integration1 as Depends of libbrasero-media0
--> obsolete library.

apt later reconsiders libbrasero-media0 itself:

Investigating (0) libbrasero-media0 [ amd64 ] < 2.30.2-0ubuntu1.1 > ( libs )
Broken libbrasero-media0:amd64 Depends on brasero-common [ amd64 ] < 
2.30.2-0ubuntu1.1 -> 3.4.1-0ubuntu1 > ( gnome ) (< 2.31)
  Considering brasero-common:amd64 10 as a solution to libbrasero-media0:amd64 
-1
  Removing libbrasero-media0:amd64 rather than change brasero-common:amd64

But this happens too late to get liblaunchpad-integration-3.0-1
reconsidered.

An artificial Breaks: from liblaunchpad-integration-3.0-1 to libbrasero-
media0 might be a sufficient hammer.  I'd suggest testing with a mocked-
up Packages file that introduces such a breaks, rather than going
through an SRU cycle to test this.

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https://bugs.launchpad.net/bugs/1029531

Title:
  cdromupgrade from Lucid to Precise failed with unmet dependencies
  without network connection

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