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I added

deb http://ppa.launchpad.net/cassou/emacs/ubuntu raring main 
deb-src ... raring main

to /etc/apt/sources.list and did sudo add-apt-repository, sudo apt-get update, and sudo apt-get install emacs-snapshot-el emacs-snapshot-gtk emacs-snapshot to install emacs snapshot under 13.04. I obtained failed to fetch and other errors, probably due to emacs-snapshot not being available for 13.04 (yet). I then added the above lines in /etc/apt/sources.list also for quantal in the hope that would work to install emacs snapshot under 13.04. Although this looks less hopeless, I obtained:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 emacs-snapshot : Depends: emacs-snapshot-bin-common (= 2:20130317-1~ppa1~quantal1)     
but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

How can I solve this?

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closed as off topic by Alvar, Kevin Bowen, Luis Alvarado Mar 26 '13 at 16:38

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here. If this question can be reworded to fit the rules in the help center, please edit the question.

Alpa and betas are considered off-topic here on AU, check the FAQ. –  Alvar Mar 26 '13 at 16:37
I didn't know that. But then it seems strange to have a tag 13.04 :-) –  Marius Hofert Mar 26 '13 at 16:50
That tag is at the moment about features or functions or other information that is about 13.04 that already have been decided. Questions about that are about bugs and problems with the system 13.04 (until it's released) are off topic because they might disappear until the stable version is released. –  Alvar Mar 26 '13 at 17:51

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