[ubuntu] How do I Install Linphone Team PPA On Ubuntu 12.04?

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http://ubuntuforums.org – I checked out the linphone team ppa page on launchpad, and it doesn't describe how to use the terminal to install it, and help section doesn't help much. Since after ubuntu 9.10, ppa use a single line for installation, what is the single line for the linphone team ppa. Here is the technical info the page gives. This PPA can be added to your system manually by copying the lines below and adding them to your system's software sources. Display sources.list entries for: deb http://ppa.launchpad.net/linphone/release/ubuntu precise main deb-src http://ppa.launchpad.net/linphone/releas (Hardware)