zabbix frontend failed after upgrade

[Jean-Max Reymond]

I had an zabbix based on postgresql which was running on Ubuntu 20.04 since two years.
After upgrading from 20.04 to 22.04, the backend is already running but frontend displays the message
Configuration file error

    DB type "POSTGRESQL" is not supported by current setup. Possible values MYSQL.

[Jean-Max Reymond (jmreymond-free)]

php8.1-pgsql is not installed, you need
apt install php8.1-pgsql
In the file configuration for apache2
you need to add
<IfModule mod_php8.c>
    php_value max_execution_time 300
    php_value memory_limit 128M
    php_value post_max_size 16M
    php_value upload_max_filesize 2M
    php_value max_input_time 300
    php_value always_populate_raw_post_data -1
    php_value date.timezone Europe/Paris
    # php_value date.timezone Europe/Riga
</IfModule>
and it works