The same list is also available from the Persistent Storage settings, by clicking on the [[!img lib/emblem-system.png class="symbolic" link="no"]] button of the <span class="guilabel">**Additional Software</span>** feature.
The same list is also available from the Persistent Storagesettings, by clicking on the [[!img lib/emblem-system.png class="symbolic" link="no"]] button of the **Additional Software** feature.
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Correct the ownership and permissions of your additional `sources.list` files to be owned by `root` and only readable by others. For example:, execute the following commands.
Correct the ownership and permissions of your additional `sources.list` files to be owned by `root` and only readable by others. For example, execute the following commands.