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I upgraded Ubuntu from 18 to 20.04. After upgrade, my codeignator is not working.

Type: Error Message: Undefined class constant 'MYSQL_ATTR_INIT_COMMAND'
Filename: /var/www/tech/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
Line Number: 145

I tried below command resulting in this error:

sudo apt-get install php7.4-mysql

The following packages have unmet dependencies:

php7.4-mysql : Depends: php7.4-common (= 7.4.3-4ubuntu2.4) but 7.4.13-1+ubuntu18.04.1+deb.sury.org+1 is to be installed E: Unable to correct problems, you have held broken packages.

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