How to run a TPM simulator on a Ubuntu machine (maybe incorrect DBus)?

I have a Ubuntu set up in WSL2. Then I tried instructions at https://wiki.ubuntu.com/TPM/Testing and tried to set up TPM simulator on Ubuntu. But for some reason I seem to end up in a situation I can't start the simulator due to DBus error, while the real problem might be different. I can replicate this same problem also trying to set up a TPM simulator in GitHub action using ubuntu-latest. So, it occurred to me maybe Ubuntu forums someone knows better, it appears this same troubles people on TPM GitHub threads too. :)

The current sequence I have is as follows:

sudo apt-get updatesudo apt-get install tpm2-abrmdsudo apt-get install libtss2-tcti-tabrmd-devsudo tpm2-abrmd --tcti=mssim --allow-root

or on GitHub Actions the second part is

sudo service tpm2-abrmd startsudo tpm2-abrmd --allow-root --tcti=mssim --logger=stdout

which seem to work due the way the access rights are set up.

:~$ sudo tpm2-abrmd --tcti=mssim --allow-root

** (process:741): WARNING **: 16:36:40.585: tcti_conf before: "device:/dev/tpm0"

** (tpm2-abrmd:741): WARNING **: 16:36:40.585: tcti_conf after: "mssim"

** (tpm2-abrmd:741): WARNING **: 16:36:40.586: Failed to get proxy for DBus daemon (org.freedesktop.DBus): Could not connect: No such file or directory

** (tpm2-abrmd:741): CRITICAL **: 16:36:40.586: Failed to acquire DBus name com.intel.tss2.Tabrmd. UID 0 must be allowed to "own" this name. Check DBus config and check that this is running as user tss or root.WARNING:tcti:src/util/io.c:251:socket_connect() Failed to connect to host 127.0.0.1, port 2321: errno 111: Connection refusedWARNING:tcti:src/tss2-tcti/tctildr.c:62:tcti_from_init() TCTI init for function 0x7f0f40e733d0 failed with a000aWARNING:tcti:src/tss2-tcti/tctildr.c:92:tcti_from_info() Could not initialize TCTI named: tcti-socketERROR:tcti:src/tss2-tcti/tctildr-dl.c:150:tcti_from_file() Could not initialize TCTI file: mssimERROR:tcti:src/tss2-tcti/tctildr.c:418:Tss2_TctiLdr_Initialize_Ex() Failed to instantiate TCTI

** (tpm2-abrmd:741): CRITICAL **: 16:36:40.586: init_thread_func: failed to create TCTI with conf "mssim", got RC: 0xa000a

Looking at DBus configuration, there is

:/etc/dbus-1/system.d$ cat tpm2-abrmd.conf<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN""http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd"><busconfig><!-- ../system.conf have denied everything, so we just punch some holes --><policy user="tss"><allow own="com.intel.tss2.Tabrmd"/></policy><policy user="root"><allow own="com.intel.tss2.Tabrmd"/></policy><policy user="XYZ"><allow own="com.intel.tss2.Tabrmd"/></policy><policy context="default"><allow send_destination="com.intel.tss2.Tabrmd"/><allow receive_sender="com.intel.tss2.Tabrmd"/></policy></busconfig>

Also

cat tpm2-abrmd.service[Unit]Description=TPM2 Access Broker and Resource Management DaemonAfter=systemd-udev-settle.serviceRequires=systemd-udev-settle.service# This condition is needed when using the device TCTI. If the# TCP mssim is used then the condition should be commented out.# ConditionPathExistsGlob=/dev/tpm*[Service]Type=dbusBusName=com.intel.tss2.TabrmdStandardOutput=syslogExecStart=/usr/sbin/tpm2-abrmd --tcti=mssimUser=tss[Install]WantedBy=multi-user.target

I'll add that running like

sudo -u tss /usr/local/sbin/tpm2-abrmd --tcti=mssim --logger=stdout &

Seem to make no difference. The result of that is

> [2] 163XYZ@ABC:/$ sudo: /usr/local/sbin/tpm2-abrmd: command not found[2]-  Exit 1                  sudo -u tss /usr/local/sbin/tpm2-abrmd --tcti=mssim --logger=stdout

It may also be, even likely, I don't know what I'm doing. Being fairly new to Linux and Ubuntu.