How to install new mbstring 7.2 php (ubuntu) module?

Question

ubuntu

It was earlier than php 7.0, it was necessary to install 7.2, installed it, after the mbstring module stopped working, I try to enable it

sudo phpenmod mbstring

WARNING: Module mbstring ini file doesn't exist under /etc/php/7.2/mods-available
WARNING: Module mbstring ini file doesn't exist under /etc/php/7.2/mods-available
WARNING: Module mbstring ini file doesn't exist under /etc/php/7.3/mods-available

check php version

php -v
PHP 7.3.7-2+ubuntu16.04.1+deb.sury.org+1 (cli) 

phpinfo();
PHP Version 7.2.20-2+ubuntu16.04.1+deb.sury.org+1

As far as I understand, I have some kind of both 7.2 and 7.3 php installed, and there is no mbstring module ...
How can I reinstall everything so that there is a single version of php 7.2 and these modules are?

Answer 1

to start with
, sudo update-alternatives --set php /usr/bin/php7.2
so that the console php is also 7.2
// it's useless to delete, debian will either drag 7.3 during the update, or initially want to remove some global packages.