Systemd does not work with ROS2

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Hello,

I am having a hard time working with systemd.
I would like to run some ROS2 node or launch file at startup, but it does not work.
I am using ROS2 Foxy on Ubuntu 20.04.

Here is my systemd unit service file (/etc/systemd/system/talker.service):

[Unit]
Description=run a simple ROS2 script
After=multi-user.target

[Service]
Type=simple
WorkingDirectory=/home/student/
ExecStart=/usr/bin/bash /usr/local/bin/talker.sh

And here is my script (/usr/local/bin/talker.sh):
I added a ' so we can see the hashtag '#

'#!/bin/bash
source /opt/ros/foxy/setup.bash
echo "run simple talker node"
ros2 run demo_nodes_cpp talker

Then I run in a terminal:

sudo chmod 744 /usr/local/bin/talker.sh
sudo chmod 664 /etc/systemd/system/talker.service
sudo systemctl daemon-reload
sudo systemctl enable talker.service
sudo systemctl start talker.service
systemctl status talker.service

And I get this error :

● talker.service - run a simple ROS2 script
Loaded: loaded (/etc/systemd/system/talker.service; static; vendor preset: enabled)
Active: failed (Result: exit-code) since Thu 2020-12-17 13:10:41 CET; 1s ago
Process: 16553 ExecStart=/usr/bin/bash /usr/local/bin/talker.sh (code=exited, status=250)
Main PID: 16553 (code=exited, status=250)

Dec 17 13:10:40 student-W65-W67RZ1 systemd[1]: Started run a simple ROS2 script.
Dec 17 13:10:40 student-W65-W67RZ1 bash[16553]: run simple talker node
Dec 17 13:10:40 student-W65-W67RZ1 bash[16592]: [ERROR] [1608207040.834854884] [rclcpp]: rcl context unexpectedly not shutdown during cleanup
Dec 17 13:10:40 student-W65-W67RZ1 bash[16592]: terminate called after throwing an instance of 'rclcpp::exceptions::RCLError'
Dec 17 13:10:40 student-W65-W67RZ1 bash[16592]: what(): failed to configure logging: Failed to get users home directory, at /tmp/binarydeb/ros-foxy-rcl-logging-spdlog-1.0.1/src/rcl_logging_spdlog.cpp>
Dec 17 13:10:41 student-W65-W67RZ1 systemd[1]: talker.service: Main process exited, code=exited, status=250/n/a
Dec 17 13:10:41 student-W65-W67RZ1 systemd[1]: talker.service: Failed with result 'exit-code'.

If someone can share a systemd unit service file to make it work or explain the error it would be greatly appreciated.
Or if someone recommands a better way of starting files at startup.

Regards,
Cocodmdr