upgrade chimaera to daedalus (from devuan.org)

- update/upgrade chimaera
$ apt update
$ apt upgrade

- update apt sources.list
$ cd /etc ; sed -i 's/chimaera/daedalus/g'  apt/sources.list ; cd - >/dev/null

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

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