Distro upgrade documentation
In the wiki/all-manuals page I don't find the right procedure to upgrade Trisquel version, for example from Flidas (8) to Etiona (9)
I believe a new chapter "Upgrade trisquel version" should be in parallel to IV/'Installing Trisquel'
The Update Manager should notify the existence of a new version and a button to upgrade. However, from Trisquel 8 to Trisquel 9, it was not, in my experience. The "normal" terminal way, 'sudo do-release-upgrade', was not working either for me. I had to use 'sudo do-release-upgrade -d'.
Feel free to add information to Trisquel's documentation: it is a wiki.