[Installing php extension not recogned]

@requinix I didn't know about Ubuntu's LAMP, I didn't even research it, I've always use the LAMP from Bitnami.  Thank you.

[Installing php extension not recogned]

Ubuntu 20.04 (desktop version) in a VirtualBox
Bitnami Lampstack 7.2.31
PHP 7.4.6
GLPI 9.5.0 rc1

Missing extensions:
CAS
sodium

I want to setup a test machine to look at GLPI and see if it's any good but there are a couple of php extensions I need to install. It doesn't matter what I do to install them GLPI says they are not installed.

I have seen that I have two php.ini files which makes me think that PHP might be installed twice in different locations. And when I try to install the extension it might be installing the extension in the wrong PHP installation.

These two php.ini
/home/matthew/lampstack/php/etc/php.ini
/etc/php/7.4/cli/php.ini

I've tried editing the php.ini files and I've tried following different tutorials telling me to

For example with CAS I get:
matthew@matthew-GLPI:/etc/php/7.4/cli$ sudo apt-get install -y php-cas
[sudo] password for matthew:
Reading package lists... Done
Building dependency tree
Reading state information... Done
php-cas is already the newest version (1.3.8-1).
0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.
matthew@matthew-GLPI:/etc/php/7.4/cli$

Note: I get errors when I check the version, but I loads of errors trying to get ldap extension installed and despite this error GLPI recognises it and says it's installed.
matthew@matthew-GLPI:/etc/php/7.4/cli$ php -v
PHP Warning: PHP Startup: Unable to load dynamic library 'ldap' (tried: /usr/lib/php/20190902/ldap (/usr/lib/php/20190902/ldap: cannot open shared object file: No such file or directory), /usr/lib/php/20190902/ldap.so (/usr/lib/php/20190902/ldap.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP Warning: Module 'sodium' already loaded in Unknown on line 0
PHP 7.4.3 (cli) (built: May 26 2020 12:24:22) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies


How do I specify which php installation to install an extension to when doing a install command on the command line?

What am I getting wrong?

I'm generally confused.