21.10.1

• Support installing from multiple sources. On the ISO, casper/install-sources.yaml provides a catalog of possible install types, which allows server installer users to choose today from a 'minimal' and 'normal' install type.
• Update snap to be based upon core20.
• console-conf: fix TypeError crash. (LP: #1903050)
• s390x: fix crash issue with a large number of ccw devices (LP: #1944516)
• autoinstall:
  • Fix two cases where the sample autoinstall-user-data generated upon install completion was not valid (kernel, snap).
  • Fix erratic hang in a partially interactive install. (LP: #1939176)
  • Fix issue with unspecified logical volume size (which means "fill the remaining space in the volume group"). (LP: #1941968)
  • Never match a disk with 0 size. (LP: #1943609)
• Fix hang on snap screen if the install environment has a network but cannot reach the snap API endpoint.
• LVM: fix crash with some LV sizes. (LP: #1935969)
• ubuntu-desktop-installer support:
  • Add new /storage/v2 API to facilitate the non-guided partitioning screen
  • Fix issue where the API deserializer was more strict than intended, and required that API clients supply all values, including ones that have default values
  • Add api arguments to allow an immediate shutdown or reboot.
• update curtin:
  • install shim-signed when available (primarily affecting arm64)
  • change sources.list handling to use python3-apt
  • add ability to selectively disable components in the sources.list