I have almost the same issue, but not in a Live Session.  I upgraded to 12.04 
LTS via 11.10 and 12.04 Beta2.
Now I always receive a "Duplicate sources.list entry" error whenever I apt-get 
update.  (I update daily.) 
I'm on an amd64 machine and don't know where the i386_Packages file in 
/var/lib/apt/lists came from. (There is no corresponding entry in sources.list)
---msg---
W: Duplicate sources.list entry http://extras.ubuntu.com/ubuntu/ precise/main 
amd64 Packages 
(/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-amd64_Packages)
W: Duplicate sources.list entry http://extras.ubuntu.com/ubuntu/ precise/main 
i386 Packages 
(/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
---end---
I tried deleting the i386_Packages file from /var/lib/apt/lists and it solved 
the issue until the next reboot, when it magically reappeared in

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https://bugs.launchpad.net/bugs/975312

Title:
  duplicated sources list entry

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