;-)
I am switching back to Trisquel 7 and will follow the advice to install .deb
packages.
I did not mean install everything via .deb packages, most software is
available in the Trisquel repositaries with your Synaptic Package Manager.
a .deb package exemple is you can install the latest Firejail .deb
package(https://firejail.wordpress.com/), but not Ring, because Ring no
longer makes available a less recent version for Ubuntu 14.04 LTS
derivatives.(https://ring.cx/en/download/gnu-linux).
Debian has an armada of developpers, whereas Trisquel is a very small team.
There are numerous threads about Debian here,
https://www.gnu.org/distros/common-distros.html#Debian
Explaining Why We Don't Endorse Other Systems
https://trisquel.info/fr/forum/getting-debian-fsf-approved