Installing froxlor on Trisquel 11

sudo apt install wget

apt -y install apt-transport-https lsb-release ca-certificates curl gnupg

curl -sSLo /usr/share/keyrings/deb.froxlor.org-froxlor.gpg https://deb.froxlor.org/froxlor.gpg

sudo sh -c 'echo "deb [signed-by=/usr/share/keyrings/deb.froxlor.org-froxlor.gpg] https://deb.froxlor.org/ubuntu jammy main" > /etc/apt/sources.list.d/froxlor.list'

sudo apt update && sudo apt upgrade

sudo apt install froxlor

Not required but recommended

The following php extensions could not be found but are recommended

gnupg

sudo apt install php-gnupg