[Koha] Not able to create instance in koha

[Sahadeo Taware]

Dear Friends

I am not able to create instance in koha if gives following error

sudo koha-create --create-db opac
AH00558: apache2: Could not reliably determine the server's fully qualified
domain name, using 127.0.1.1. Set the 'ServerName' directive globally to
suppress this message
AH00558: apache2: Could not reliably determine the server's fully qualified
domain name, using 127.0.1.1. Set the 'ServerName' directive globally to
suppress this message
AH00558: apache2: Could not reliably determine the server's fully qualified
domain name, using 127.0.1.1. Set the 'ServerName' directive globally to
suppress this message
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using
password: NO)

I am using ubuntu 20.04 koha version 20.11.02.000