Hello, I just wanted to mention, that this situation of version-change, from luks 1 to luks 2, makes a multi-boot Stretch-Buster impossible - at least in my situation.
I had sda1 as /boot, sda2 as encrypted Stretch (luks 1), Grub in MBR and installed Buster (I used the XFCE4-installation-CD) encrypted (luks 2) to sda3 (all primary Partitions). Now the fact is, that I cannot start Stretch on sda2 anymore, not with the installed Grub, nor with any "Rescuedisks", or similar... I had to chroot in Stretch, install Grub from there again and build the "initram.img" new, e.g. update it with "dpkg-reconfigure cryptsetup" afterwards - now I can start Stretch again, but not at all Buster... Theres also a second bug about this: after installation of Buster, I can see "cryptsetup" as package installed, but I cannot fetch the command in a terminal (as root). Neighter "cryptsetup"-command, nor "dpkg-reconfigure"-command is available in terminal, even if the packages are shown as installed. But if I use the XFCE4-installation-CD in "rescue/repair-mode" on sda3 (Buster) as root, these commands are available again... Greetings, Jack
