Official Synex APT indices and installation ISOs.
sudo curl -fsSL http://repo.synex.ar/synex.gpg.key -o /usr/share/keyrings/synex.gpg echo "deb [signed-by=/usr/share/keyrings/synex.gpg] http://repo.synex.ar synex main" | sudo tee /etc/apt/sources.list.d/synex.list sudo apt update