Excalibur (so the Ceres) has ongoing merge of /usr which, I presume, breaks non-merged systems (at least till a workaround is found)

Stick with stable instead, on which runit (and the system itself) works as should
Ye also can go with Excalibur (testing) as well, though it's not best material for production either

1 - I downloaded the Excalibur iso image: result impossible to install -> is it normal to have an image available for download that can't be installed without any information available (I found the info only on this forum)?

2 - I downloaded the Daedalus ISO: my AMD video card doesn't work, the driver is missing (I was able to correct the problem) -> is this normal?

3 I tried to switch to ceres by modifying /etc/apt/sources.list with this single active line :
“deb http://deb.devuan.org/merged ceres main”
then sudo apt update && apt dist-upgrade -> process interrupted by usrmerge with libsane1 rules (I tried to uninstall sane-utils and repeat the process : update terminated normally but the system is no longer operational!)

How to have a Devuan ceres physically installed with runit?
1- Is it possible to have ceres with runit?
2- which iso to use?
2- how to migrate to ceres?

thanks.