A few more details...
I used kernel-6182 & initrd from:
verified with help from:
I had to restart a few times because my previous RAID
setup was detected by D-I and I was afraid it would interfere
with the new install (I wanted to change partition layout)
The (multiple-minutes-long) flashing at the end of D-I
was getting on my nerves (I saw it stuck at 66% for a
long time) but eventually finished properly.