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I installed XAMPP on Ubuntu 18.04, ran /opt/lampp/lampp start and all the services started successfully. However, when I try to run mysql -u root -p I get this error:

"ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)"

If I try to run sudo service mysql start, I get this error: "Failed to start mysql.service: Unit mysql.service not found."

I have uninstalled and reinstalled XAMPP. I can still access phpMyAdmin and display the index.html on the browser. I've also read several other posts with similar titles, but none of the proposed solutions has fixed my issue.

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If you want to run the XAMPP`s mysql you should run:

/opt/xampp/bin/mysql instead of mysql

The error may be because you already have mysql package installed via apt

NB: XAMPP includes MariaDB not MySQL

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This error in my case was caused by a previous MYSQL installation and a subsequent XAMPP installation, these two conflict with each other as there are two MYSQL fighting for listener port etc.

The solution in my case was:

Stop MYSQL initial install (not the XAMPP)

$> systemctl status mysql.service   ## Check the status 

$> systemctl stop mysql.service     ## Stop the service

Start MYSQL from XAMPP

$> sudo /opt/lampp/lampp startmysql  # to start the XAMPP mysql  
$> /opt/lampp/bin/mysql              # connect to XAMPP mysql
Welcome to the MariaDB monitor.  Commands end with ; or \g. Your
MariaDB connection id is 9 Server version: 10.4.11-MariaDB Source
distribution

........... This time didn't ask for password

Cheers

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