This can be reproduced with subiquity 20.03.2 (currently candidate). No need to have a separate disk: it is sufficient to add a partition and configure it as an encrypted LVM volume.
I'm attaching the full /var/log of the installer system. ** Attachment added: "_var_log.tar.gz" https://bugs.launchpad.net/subiquity/+bug/1874243/+attachment/5357946/+files/_var_log.tar.gz ** Also affects: curtin Importance: Undecided Status: New -- You received this bug notification because you are a member of curtin developers, which is subscribed to curtin. https://bugs.launchpad.net/bugs/1874243 Title: An error occured handling 'dm_crypt-0': TypeError - join() argument must be str or bytes, not 'NoneType' Status in curtin: New Status in subiquity: New Bug description: Crash file attached. This was an attempt at installing on /dev/sdb, which is an external sata drive. I selected lvm with encryption, but no customization. To manage notifications about this bug go to: https://bugs.launchpad.net/curtin/+bug/1874243/+subscriptions -- Mailing list: https://launchpad.net/~curtin-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~curtin-dev More help : https://help.launchpad.net/ListHelp

