Comment 20 for bug 1898129

Based on good test results with partman-crypto (comment #19)
now moving on with ubiquity (to include the updated sources).

Tests with the patched packaged built from a PPA are positive.
The results are identical to the reported for partman-crypto
(LUKS2/LUKS1 by default/as requested; installed system boots.)

Testing ubiquity from PPA:
-------------------------

Booted the Ubuntu 20.04.1 Desktop ISO.
Launch terminal:

$ sudo add-apt-repository ppa:mfo/lp1898129prop2
$ sudo apt install -y ubiquity

$ dpkg -s ubiquity | grep Version:
Version: 20.04.15.3

$ grep luksopts /lib/partman/lib/crypto-base.sh
 local mapping device cipher iv size pass luksopts
   luksopts="$RET"
   log "Additional options for luksFormat: '$luksopts'"
  log-output -t partman-crypto /sbin/cryptsetup -c $cipher-$iv -h $hash -s $size $luksopts luksFormat $device $pass

Without the option:

$ sudo debconf-get partman-crypto/luksformat_options

$

$ lsblk --ascii | grep -B1 crypt
`-vda6 252:6 0 8.8G 0 part
  `-vda6_crypt 253:0 0 8.8G 0 crypt

$ sudo cryptsetup luksDump /dev/vda6 | head -n2
LUKS header information
Version: 2

With the option:

$ sudo debconf-get partman-crypto/luksformat_options
--type luks1

$ lsblk --ascii | grep -B1 crypt
`-vda6 252:6 0 8.8G 0 part
  `-vda6_crypt 253:0 0 8.8G 0 crypt

$ sudo cryptsetup luksDump /dev/vda6 | head -n3
LUKS header information for /dev/vda6

Version: 1