It arrived. First thing to say, I was not using Sidcution, I figured I would risk 6 months until freeze in testing. First time with uefi, gpt, lvm2 and hopefully KVM. Most of the howto's are dated. I tried to set up manually with /boot in EPT and / and /swap and then adding the LVM. However, the guided version worked. It has been a long time since I have used guided.
Unfortunately (netinstall with non-free) when tasksel says Debian desktop environment just prior to gnome, I did not tick it off, and so I got gnome. I thought it would give me all of the xorg that I would need. Bleagh. I ended up reinstalling and trying lxqt from scratch. LXQT is sooo easy to install via siduction and also via Sparky's version of testing. Not so easy today being a pure debian person for this install. Thankfully LXDE went on easier, grub-uefi is working out, lvm is something I should have tried long ago and I think I have figured out the slight differences between stable and testing for KVM and libvirt-bin versus libvirt0.
chroot /target
apt-get install -f
is your friend for testing installs somedays.
peace out