Yes, Ciaran is true. It was like “running forward” from a problem I had, and it went kind-of-well, and since then, everything is ok, but “never again”!

I tremble each time I do “apt dist-upgrade” and/or reboot, and for sure I miss the security updates (they come, but not as quickly as with stable).

So, “ok” for the experiment, and thanks that it will end in less than one month. I feel quite more comfortable in “stable” and will stay there for loong time I think :)