Thanks folks, problem solved.

# upgrade from Chimaera to Daedalus

nano /etc/apt/sources.list
deb http://deb.devuan.org/merged daedalus main
deb http://deb.devuan.org/merged daedalus-updates main
deb http://deb.devuan.org/merged daedalus-security main
#deb http://deb.devuan.org/merged daedalus-backports main

apt-get update
apt-get upgrade

(reboot)

apt install xfce4
apt install xfce-terminal
apt install xfce-goodies
apt install firefox-esr
startxfce4