New answers tagged software-sources
12.10 is an unsupported release. You can't depend on its software repositories being maintained anymore. Your only valid upgrade path from 12.04 would be directly to 14.04 - the next LTS release. Edit /etc/update-manager/release-upgrades and set Prompt=lts Run do-release-upgrade in a terminal.
Not an official tutorial, but worked successfully for me with lubuntu. 1. Change /etc/apt/sources.list to a 13.10 repository (use the list generator from http://repogen.simplylinux.ch/) 2. apt-get update && apt-get upgrade && reboot && apt-get dist-upgrade (will upgrade to 13.10. Don't panik if your desktop is lost. Solve ...
Well I needed in the end to clear all the gpg keys from /etc/apt/trusted.gpg.d then sudo apt-get update and sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys KEY for every key that was missing. Please comment if that's wrong (in some way). It's all commented here 13.10 https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1263540 new ...
You dont export or import sources, at least I don't understand what you mean. Just create a copy of /etc/apt/sources.lst and then edit the original file, replacing all occurrences of saucy with trusty. Then do apt-get update and you have the new package list. If you fancy it, you can then do a apt-get dist-upgrade.
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