我将 Ubuntu 从 18 升级到了 20.04。升级后，我的 codeignator 无法正常工作。
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
我尝试了以下命令，但出现了以下错误：
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.