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I am trying to install Coot on a laptop that runs Ubuntu. Following the instructions on the CCp4wiki http://strucbio.biologie.uni-konstanz.de/ccp4wiki/index.php/Coot#Packages_for_Ubuntu sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1DC81A57 sudo add-apt-repository ppa:mok0/ppa apt-get update && apt-get install coot <- I had to add "sudo" to the beginning of this command and after the && and I received this fail message "Package coot is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'coot' has no installation candidate" is there some other name/link for the package other than the word "coot" or do I need to install it by some other method other than what I have been doing?