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

ramana_sharma@ramana:~$ mysql --version mysql Ver 14.14 Distrib 5.7.26, for Linux (x86_64) using EditLine wrapper ramana_sharma@ramana:~$ mysql -uroot -proot0 mysql: [Warning] Using a password on the command line interface can be insecure. ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock’ (2) ramana_sharma@ramana:~$ mysql -u root -p Enter password: ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock’ (2) ramana_sharma@ramana:~$ services mysql start No command ‘services’ found, did you mean: Command ‘service’ from package ‘init-system-helpers’ (main) services: command not found ramana_sharma@ramana:~$ /etc/init.d/mysql start bash: /etc/init.d/mysql: No such file or directory ramana_sharma@ramana:~$ #/usr/sbin/mysqld --defaults-file=/etc/mysql/my.cnf --basedir=/usr --datadir=/var/lib/mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock ramana_sharma@ramana:~$ /etc/init.d/mysql start bash: /etc/init.d/mysql: No such file or directory ramana_sharma@ramana:~$ sudo service mysql restart [sudo] password for ramana_sharma: Failed to restart mysql.service: Unit mysql.service not found. ramana_sharma@ramana:~$ sudo nano /etc/mysql/my.cnf ramana_sharma@ramana:~$ systemctl enable mysql Failed to execute operation: No such file or directory