Can't mount crypted RAID1 disks after stable install from buster netinstall
I've installed a system with / on two disks in software RAID1 with
dm_crypt on top from a buster netinstall disk 20190429-03:57.
I'm using a buster netinstall disk because the machine's ixgbe network
adapters aren't supported under stable.
After a stable install and rebooting, it isn't possible to unencrypt
the RAIDed volume. I've ensured the password is correct by copying and
pasting on a serial console connection and also trying many times by
keyboard and ipmi virtual keyboard. I've also tried the reinstall over
5 times with slightly different options including ensuring all available
kernel modules are installed.
Mounting works fine if I install buster rather than stretch with exactly
the same configuration.
* could there be a problem in the stable component of the installer
for grub or other mising support for dm_crypt?
* since I'm aiming to run stable on this machine but I need recent ixgbe
network modules anyway, can I install the kernel-image-4.19.0-0.bpo
backport package at the end of the installation process from a console?
I'm hoping this will also solve the mounting problem I'm experiencing.
Thanks very much