Verification done for focal:

- Environment -

ubuntu@crustle:~$ uname -a
Linux crustle 5.4.0-125-generic #141-Ubuntu SMP Wed Aug 10 13:42:03 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

ubuntu@crustle:~$ cat /etc/os-release 
NAME="Ubuntu"
VERSION="20.04.4 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.4 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

ubuntu@crustle:~$ systemd --version
systemd 245 (245.4-4ubuntu3.18)
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=hybrid

root@crustle:/home/ubuntu# cat /sys/module/pstore/parameters/backend
efi

-----------------

- Test steps -

See [Test Plan]

-----------------

- Result -

Verification : OK

root@crustle:/home/ubuntu# echo 1 > /proc/sys/kernel/sysrq
root@crustle:/home/ubuntu# echo 1 > /proc/sys/kernel/panic
root@crustle:/home/ubuntu# echo "c" > /proc/sysrq-trigger

* system reboots *

root@crustle:/home/ubuntu# ls /sys/fs/pstore
root@crustle:/home/ubuntu# ls /var/lib/systemd/pstore
166271364
root@crustle:/home/ubuntu# systemctl status systemd-pstore
● systemd-pstore.service - Platform Persistent Storage Archival
     Loaded: loaded (/lib/systemd/system/systemd-pstore.service; enabled; vendor preset: enabled)
     Active: active (exited) since Fri 2022-09-09 08:57:29 UTC; 3min 10s ago
       Docs: man:systemd-pstore(8)
    Process: 639 ExecStart=/lib/systemd/systemd-pstore (code=exited, status=0/SUCCESS)
   Main PID: 639 (code=exited, status=0/SUCCESS)

Sep 09 08:57:29 crustle systemd-pstore[639]: PStore dmesg-efi-166271364709001 moved to /var/lib/systemd/pstore/166271364/dmesg-efi-166271364709001
Sep 09 08:57:29 crustle systemd-pstore[639]: PStore dmesg-efi-166271364708001 moved to /var/lib/systemd/pstore/166271364/dmesg-efi-166271364708001
Sep 09 08:57:29 crustle systemd-pstore[639]: PStore dmesg-efi-166271364607001 moved to /var/lib/systemd/pstore/166271364/dmesg-efi-166271364607001
Sep 09 08:57:29 crustle systemd-pstore[639]: PStore dmesg-efi-166271364606001 moved to /var/lib/systemd/pstore/166271364/dmesg-efi-166271364606001
Sep 09 08:57:29 crustle systemd-pstore[639]: PStore dmesg-efi-166271364605001 moved to /var/lib/systemd/pstore/166271364/dmesg-efi-166271364605001
Sep 09 08:57:29 crustle systemd-pstore[639]: PStore dmesg-efi-166271364604001 moved to /var/lib/systemd/pstore/166271364/dmesg-efi-166271364604001
Sep 09 08:57:29 crustle systemd-pstore[639]: PStore dmesg-efi-166271364603001 moved to /var/lib/systemd/pstore/166271364/dmesg-efi-166271364603001
Sep 09 08:57:29 crustle systemd-pstore[639]: PStore dmesg-efi-166271364602001 moved to /var/lib/systemd/pstore/166271364/dmesg-efi-166271364602001
Sep 09 08:57:29 crustle systemd-pstore[639]: PStore dmesg-efi-166271364601001 moved to /var/lib/systemd/pstore/166271364/dmesg-efi-166271364601001
Sep 09 08:57:29 crustle systemd[1]: Finished Platform Persistent Storage Archival.