21.01.1

The largest change in this release is one that should be largely invisible to users: subiquity is now split into a server process that actually runs the install and one or more client processes that the user interacts with to configure the install. One visible change to this is that for a non-interactive install, progress is shown in all clients, so on tty1 and any serial lines and if you log in via ssh.

Other changes and fixes:

• Improved support for DASD drives (a kind of storage found on IBM mainframes), including support for FBA DASD drives, unformatted ECKD drives and ECKD drives passed to KVM virtual machines via virtio-blk (LP: #1885890, LP: #1887669, LP: #1893775)
• Make matching a disk by model or vendor actually work properly
• Print autoinstall progress to console on s390x
• Make "update: no" inhibit updates in the refresh section of the autoinstall data.
• Update curtin to a new snapshot that contains fixes for a few bugs:
• Do not fail if ID_SERIAL contains "=" (LP: #1895021)
• Fix removing partitions on multipathed drives (LP: #1900900)