In order to fix this for Focal / 20.04.2 point release:
Groovy is a no-op, because:
1) it has no partman-crypto as stand-alone src pkg anymore.
2) its ubiquity (w/ bundled partman-crypto) doesn't need a
patch as there won't be new ISOs/Desktop install for it.
[thus, partman-crypto: Invalid / ubiquity: Won't Fix.]
Focal needs the fix in both, in two steps:
1) patch partman-crypto (stills exists as stand-alone src pkg.)
2) update ubiquity w/ the patched partman-crypto (in proposed.)
[thus, partman-crypto: In Progress / ubiquity: In Progress.]
** Description changed:
+ [Impact]
+
+ * Users cannot specify options for 'cryptsetup luksFormat'
+ that is used by the installer.
+
+ * Some deployments need the installed disks in LUKS1 format
+ for backward compatibility with older releases that don't
+ support LUKS2, for backup/audit/management purposes.
+
+ * However, on Focal and later, cryptsetup defaults to LUKS2,
+ which broke that functionality.
+
+ * Currently it's not possible to request the LUKS format in
+ the installer, so this patch allows for that w/ a preseed
+ option ('partman-crypto/luksformat_options') for the user.
+
+ [Test Case]
+
+ * Default behavior: LUKS2
+
+ - Install Ubuntu (Focal/later); check LUKS header version:
+
+ $ sudo cryptsetup luksDump /dev/vda4
+ LUKS header information
+ Version: 2
+ ...
+
+ * Opt-in behavior: LUKS1 (for example; can use other options)
+
+ - Install Ubuntu (Focal/later) with preseed file/option:
+
+ ubiquity partman-crypto/luksformat_options string \
+ --type luks1
+
+ - Check LUKS header version:
+
+ $ sudo cryptsetup luksDump /dev/vda4
+ LUKS header information for /dev/vda4
+ Version: 1
+ ...
+
+ - Check install logs for confirmation:
+
+ $ grep luksFormat /var/log/partman
+ /usr/bin/autopartition-crypto: Additional options for luksFormat:
'--type luks1'
+
+ [Where problems could occur]
+
+ * The changes are contained within the partman-crypto functionality,
+ so only install with encrypted disks should be affected by issues.
+
+ * Any additional options specified to 'cryptsetup luksFormat' are
+ opt-in _and_ specified by the user via the preseed option, thus
+ errors are probably tied to particular options (mis) used.
+
+ * If the preseed option is not specified, original behavior remains.
+
+ [Other Info]
+
+ * This patch is applied in Hirsute.
+ * This patch is not needed in Groovy (rationale in comment #15.)
+ * This patch is targeted at Focal (cryptsetup defaulted to LUKS2.)
+ * This patch is not needed in Bionic/earlier (^defaults to LUKS1.)
+
+ [Original Description]
Most users should be fine with the options to
'cryptsetup luksFormat' used by the installer.
However, some users may have reasons to use
other options, and that is not possible now.
Let's provide a new preseed option for that:
'partman-crypto/luksformat_options'
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https://bugs.launchpad.net/bugs/1898129
Title:
Cannot configure 'cryptsetup luksFormat' at install time
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