Disable compression and "hash table hardening" for journald in the live installer environment as these features make the journal unreadable using the systemd libraries from 20.04 that are included in the subiquity snap.

debian/changelog

@@ -1,3 +1,12 @@
+livecd-rootfs (2.753) UNRELEASED; urgency=medium
+
+  * Disable compression and "hash table hardening" for journald in the
+    live installer environment as these features make the journal unreadable
+    using the systemd libraries from 20.04 that are included in the subiquity
+    snap. (LP: #1953744)
+
+ -- Michael Hudson-Doyle <michael.hudson@ubuntu.com>  Tue, 01 Feb 2022 16:10:28 +1300
+
 livecd-rootfs (2.752) jammy; urgency=medium
 
   * Remove references to archive.canonical.com, which is no longer used and

live-build/ubuntu-server/includes.chroot.ubuntu-server-minimal.ubuntu-server.installer/etc/systemd/journald.conf.d/no-zstd.conf

@@ -0,0 +1,4 @@
+# systemd in 22.04+ uses zstd compression by default, which is not understood
+# by the systemd libraries from focal used in the subiquity snap.
+[Journal]
+Compress=false

live-build/ubuntu-server/includes.chroot.ubuntu-server-minimal.ubuntu-server.installer/etc/systemd/system/systemd-journald.service.d/no-hardening.conf

@@ -0,0 +1,4 @@
+# systemd in 22.04+ uses "hash table hardening" by default which is not
+# understood by the systemd libraries from focal used in the subiquity snap.
+[Service]
+Environment="SYSTEMD_JOURNAL_KEYED_HASH=0"