Bug#792456: encrypted swap broken in last several debian releases

[Matt Taggart <matt@lackof.org>]

The last few debian releases (buster and bullseye at least) configuring 
encrypted swap has been broken for me. I don't know if it's the same as 
what the user in #792456 is seeing, but likely.

I have most recently tested it in Bookworm RC1 and here is what I did:
* run by hand partitioning
* create 3 partitions: boot, swap, lvm
* configure encryption: enable encryption for swap and lvm partitions
  * configure swap to use serpent and random passphrase
  * configure lvm partition to use serpent and key
  * finish
* mark lvm encrypted partition to be used for lvm, configure lvm, setup 
root and var partition
* configure boot partition to be ext4 mounted at /boot
* finish partitioning
* receive error about failure to setup swap

Sorry for the short report, I will try to redo it and capture logs, but 
I wanted to report this ASAP.

My workaround has been to allocate the partition but mark it do not use 
and then finish the setup by hand after install.

Thanks,

--
Matt Taggart
matt@lackof.org