Use this command: sudo add-apt-repository ppa: Find appropriate ppa according to your Ubuntu release version.For External Repositories, Visit Ubuntu Updates and search by.
If the package that you are unable to locate is from a PPA go to the PPA and check if it is available there for your release.
To enable all repositories ( main, universe, restricted, multiverse), use the following commands: sudo add-apt-repository main Make sure you have enabled Ubuntu repositories: The following (general) procedure helps to solve this: When apt-get install is unable to locate a package, the package you want to install couldn't be found within repositories that you have added (those in in /etc/apt/sources.list and under /etc/apt//). There are many questions about this topic.
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