upgrade chimaera to daedalus (from devuan.org)

- update/upgrade chimaera
# apt update
# apt upgrade

- update apt sources.list
# sed -i 's/chimaera/daedalus/g'  /etc/apt/sources.list

- update pkg list from daedalus
# apt update

- kill screensaver (if running)
# killall xscreensaver

- upgrade/dist-upgrade
# apt upgrade
# apt dist-upgrade

- in case of failures, fix and rerun
# apt -f install
# apt dist-upgrade

- cleanup
# apt autoremove --purge
# apt autoclean

deb http://deb.devuan.org/merged daedalus main non-free-firmware non-free contrib
deb http://deb.devuan.org/merged daedalus-security main non-free-firmware non-free contrib
deb http://deb.devuan.org/merged daedalus-updates main non-free-firmware non-free contrib

#deb-src http://deb.devuan.org/merged daedalus main 
#deb-src http://deb.devuan.org/merged daedalus-security main
#deb-src http://deb.devuan.org/merged daedalus-updates main