I want to backup all the repositories I added to the Ubuntu Software Center, but apparently
sources.list contains only the ones which belong to Canonical.
So where do I find the other ones?
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Many people find it easier to back up and restore a single file rather than dealing with a directory of files (as the other mentioned solutions require). If you are like this, and you do not care about having each PPA stored in its own file inside of
/etc/apt/sources.list.d/, you can use the following command to store all of your added repositories in a single file called
sources.list located in your home directory.
cat /etc/apt/sources.list /etc/apt/sources.list.d/*.list > ~/sources.list
You could then move this file to
/etc/apt/sources.list and do
sudo apt-get update to re-add the repositories. If you are planning to use this backup on another computer, make sure that the version of Ubuntu on the machine matches the versions in the sources.list file, otherwise, you might have some problems.
APT-Clone to Clone/Restore Packages on an Apt Based System.
It will save/restore the packages, sources.list, keyring and automatic-installed states. It can also save/restore no longer downloadable packages using dpkg-repack.
sudo apt-get install apt-clone
sudo apt-clone clone ~/path/to/apt-clone-state-ubuntu-$(lsb_release -sr)-$(date +%F).tar.gz
sudo apt-clone restore ~/path/to/apt-clone-state-ubuntu.tar.gz
Restore to newer release:
sudo apt-clone restore-new-distro ~/path/to/apt-clone-state-ubuntu.tar.gz $(lsb_release -sc)
FYI, APT-Clone is used by ubiquity (Ubuntu installer) for upgrade process.
References: man apt-clone, How to backup settings and list of installed packages