0 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

not working mysql please anyone help me