impossible to establish a connection

impossible to establish a connection
I installed percona server in my ubuntu 18.04
The status is active:
root @ ubuntu1804lts: ~ # sudo service mysql status
● mysql.service - Percona Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2019-05-27 05:13:08 UTC; 12min needle
Process: 936 ExecStartPre = / usr / share / mysql / mysql-systemd-start pre (code = exited, status = 0 / SUCCESS)
Main PID: 1071 (mysqld)
Status: “SERVER_OPERATING”
Tasks: 39 (limit: 1004)
CGroup: /system.slice/mysql.service
└─1071 / usr / sbin / mysqld

May 27 05:13:01 ubuntu1804lts systemd [1]: Starting Percona Server …
May 27 05:13:08 ubuntu1804lts systemd [1]: Started Percona Server.

Unfortunately, installing wordpress, I can’t connect to the database

root@ubuntu1804lts:~# ps aux | grep mysql
mysql 1071 0.7 19.4 1374336 394372 ? Ssl 05:13 0:06 /usr/sbin/mysqld
root 1724 0.0 0.0 13136 996 pts/0 S+ 05:26 0:00 grep --color=auto mysql

root@ubuntu1804lts:~# netstat -lntu
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN

tcp6 0 0 :::33060 :::* LISTEN
tcp6 0 0 :::3306 :::* LISTEN
tcp6 0 0 :::80 :::* LISTEN
tcp6 0 0 :::22966 :::* LISTEN
udp 0 0 127.0.0.53:53 0.0.0.0:*

Thank you

Can you connect locally to the Percona Server using mysql client? Have you set up the MySQL users needed for Wordpress?

Also, is the app located on the same server or connecting remotely?