Now I can't install ubuntu-sdk and I can't resolve the problem. I used:
sudo add-apt-repository ppa:ubuntu-sdk-team/ppa
sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install ubuntu-sdk
but I have always problem with dependencies while installing ubuntu-sdk
ubuntu- sdk : Depends: ubuntu-sdk-libs-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
What can I do? Thanks