How to install extensions

[SteveMann]

What I know about PHP would fit on a postage stamp.
I have a mini-PC running Ubuntu Desktop v24.04.
I installed Apache2.
I installed PHP8.1
I installed MediaWiki.

On the first run of MediaWiki, I get this error:

In case the image doesn't appear,

MediaWiki 1.39 internal error
Installing some PHP extensions is required.
You are missing a required extension to PHP that MediaWiki requires to run. Please install:
mbstring
intl

I did a sudo apt install of both missing extensions:

sudo apt install php-intl
sudo apt install php-mbstring

No errors from the install.

But the error remains even after a reboot.

So, what do I have to do to get PHP to recognize the extensions?

 

[Michalio]

Verify the version of the php, you can check the location with all modules for current version going to /etc/php/8.1/conf.d/