Why there are more sources repos on my raspbian wheezy?
For what are they needed?
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Collabora has improved software for the foundation under contract. They implemented Hardware acceleration inside Webkit (for Ephiphany) and did work on a Wayland desktop called Maynard.
It makes sense that they run an extra repository with the improved versions.
In addition to the individual files in the
/etc/apt/sources.list.d/*.list files that Jacobm001 refers to, the "master" file in
/etc/apt/sources.list is also used - it pre-dates the "individual repository file in a sub-directory" format that Debian (and thus Raspbian) now uses, and will probably have at least a reference to a
mirrordirector.raspbian.org source which actually redirects requests to a local mirror for you.