I recommend to make a backup. If you can not or do not want, downsize said partition using GParted to release at least 5 GiB (I recommend more), turn off your computer once the resizing is complete, boot from the installation disk, select "install alongside Ubuntu" after selecting your language, after installing trisquel you will have both operating systems, move your files from the Ubuntu partition to the Trisquel partition, you can ask later how to uninstall Ubuntu.

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