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suvo@Suvodip-Lenovo ~ $ sudo apt install php-mysqli

[sudo] password for suvo:

Reading package lists... Done`enter code here`

Building dependency tree    

Reading state information... Done

Package php-mysqli is a virtual package provided by:

php7.3-mysql 7.3.2-3+ubuntu16.04.1+deb.sury.org+1

php7.2-mysql 7.2.15-1+ubuntu16.04.1+deb.sury.org+1

php7.1-mysql 7.1.26-1+ubuntu16.04.1+deb.sury.org+1

php5.6-mysql 5.6.40-1+ubuntu16.04.1+deb.sury.org+1

php7.0-mysql 7.0.33-1+ubuntu16.04.1+deb.sury.org+1

You should explicitly select one to install.

E: Package `php-mysqli` has no installation candidate