Traccar does not start / problem with mySQL database?

Hi,
I already used Traccar on a Raspberry Pi4 with UBUNTU desktop for some weeks. Unfortunately, I used it with H2 database.
So, I decided to install it newly. I that context I decided to set up my RPi4 as UBUNTI server.

Installation of the UBUNTU server worked.

Then, I tried to install the Traccar server following the Digital Ocean guide: https://www.traccar.org/install-digitalocean/

There,

sudo apt update && apt -y install unzip mysql-server

failed. Error was: /var/lib/dpkg/lock-frontend cannot be opened (access denied).

Therefore, I installed mysql-server and unzip manualle (sudo apt install ...) and proceeded to follow the guide.

Everything seemed to work.

The config file shows the correct database entry for mysql:

    <entry key='database.driver'>com.mysql.jdbc.Driver</entry>
    <entry key='database.url'>jdbc:mysql://localhost/traccar?zeroDateTimeBehavior=round&amp;serverTimezone=UTC&amp;allo>
    <entry key='database.user'>root</entry>
    <entry key='database.password'>root</entry>

But: When I try to start Traccar (sudo systemctl start traccar or sudo service traccar start), nothing happens. No error message. No log-file is created. Nothing seems to happen.

The tracker-server.jar is available under /opt/traccar

What can I do?

PS: MySQL server is running:

abc@xyz:/opt/traccar$ sudo service mysql status
● mysql.service - MySQL Community Server
     Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
     Active: active (running) since Sun 2023-09-03 20:26:47 CEST; 51min ago
    Process: 789 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
   Main PID: 966 (mysqld)
     Status: "Server is operational"
      Tasks: 37 (limit: 9236)
     Memory: 443.4M
        CPU: 38.463s
     CGroup: /system.slice/mysql.service
             └─966 /usr/sbin/mysqld

Sep 03 20:26:44 xyz systemd[1]: Starting MySQL Community Server...
Sep 03 20:26:47 xyz systemd[1]: Started MySQL Community Server.

Try running Traccar manually.

How can I run it manually?

java -jar tracker-server.jar conf/traccar.xml

Thanks, @Track-trace.

I did. Error message:

abc@xyz:/opt/traccar$ java -jar tracker-server.jar conf/traccar.xml
Error: Unable to initialize main class org.traccar.Main
Caused by: java.lang.NoClassDefFoundError: com/google/inject/Injector

Normally you first google the error message

I found somethind, but I don't understand it, since I'm not familiar with java:

https://stackoverflow.com/questions/37731507/noclassdeffounderror-com-google-inject-injector-when-running-simple-neo4j-test

The error probably indicates that you're missing some dependencies. Are you sure you installed the official release without any modifications?

I followed the guide…

Shall I deinstall and install it newly?

Which guide? What architecture is your system?

This guide: https://www.traccar.org/install-digitalocean/

I run a Raspberry Pi 4 8 GB with Ubuntu Server latest LTS version 22.04.3

I reinstalled the Traccar server. Now it runs.

Thank you for your support.

Raspberry Pi uses ARM CPU, as far as I know. If you just follow the guide as is, it obviously won't work because it tells you to install x64 version.

Ah, ok. That might have been the reason.

Thanks again!