Well, in your original post you had output from the terminal that said "E: Unable to correct problems, you have held broken packages." that makes me think that you have some package issues that need to be resolved. Personally I would remove the ppa, and then update completely using the following code, each command one at a time, so you can really see what is going on more easily:
Code:
sudo add-apt-repository --remove ppa:ubuntu-sdk-team/ppa
sudo apt-get update
sudo apt-get dist-upgrade
If the above completes with no errors or other messages about broken packages, then you should be all set. Since you are doing a dist-upgrade however, it may be a good idea to restart as well using "sudo shutdown -r now" (without quotes) in case something major was upgraded like your kernel or display-related packages.
Then try to install the SDK ppa again with the commands you used originally.
If that doesn't fix the problem, then try the following:
Code:
dpkg --get-selections | grep hold
This will list the packages that are being held. Please post the results here, and we can move on from there. Just for reference purposes, the above code is from this post.
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