error 2002 can't connect to local mysql server through socket '/var/run/mysqld/mysqld sock 2 code example

Example 1: can't connect to local mysql server through socket '/var/run/mysqld/mysqld.sock'

# Start your mysql server
/etc/init.d/mysql start

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

##	ERROR 2002 (HY000): 
##	Can't connect to local MySQL server through socket 

#### Follow below steps and you good to go... ####
sudo dpkg-reconfigure mysql-server-{version_number}
##version_number should be mysql version number installed
## Now try login in mysql shell
sudo mysql -u root -p