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I plan to upgrade a machine from 12.04 to 14.04 LTS. I explore the best way to export the Personal Package Archive (PPA) repository list and import it back after the migration?

Does backing-up /etc/apt/sources.list and restoring source.list with the same permission is an acceptable practice?

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Does backing-up /etc/apt/sources.list and restoring sources.list with the same permission is an acceptable practice?

No, /etc/apt/sources.list file should vary for each Ubuntu version.

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You can use Y-PPA manager for that. You can install it via The following PPA. 

sudo add-apt-repository ppa:webupd8team/y-ppa-manager
sudo apt-get update
sudo apt-get install y-ppa-manager

Supported Ubuntu distributions:

Utopic(14.10), Trusty(14.04), Saucy(13.10), Raring(13.04), Quantal(12.10), Precise(12.04), Oneiric(11.10), Natty(11.04), Maverick(10.10), Lucid(10.04), Karmic(9.10)

It has many features that could help you in your situation:

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  • Backup an restore PPAs (automatically imports missing GPG keys)

  • Re-enable working PPAs after Ubuntu upgrade: when you upgrade to a newer Ubuntu release, the PPAs are disabled so using this feature, the PPAs that work with the new Ubuntu version you're using are re-enabled, leaving the others disabled

  • Update release name in working PPAs: somewhat similar to the feature above, this one is useful if you've backup up the PPAs in say Ubuntu Precise and restored them in Ubuntu Quantal (just an example) - in this case, using this feature you can replace "precise" in each PPA source with "quantal", but only for the PPAs that have packages for Quantal.

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Reference:

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