I am trying to install Laravel. I am on Ubuntu 18.04.5 LTS, have php 8.0.2, and running Apache2. My issue is that I can't install Laravel as it keeps giving the error that I don't have the 'mbstring' extension.

When I do the commands

sudo apt update



sudo apt install php-mbstring

they get installed to /etc/php/7.2/mods-available. Laravel is looking for the extensions in /etc/php/8.0/. I have also tried installing the newest version of mbstring:

sudo apt install php8.0-mbstring

But get the error

Reading package lists... Done

Building dependency tree

Reading state information... Done

E: Unable to locate package php8.0-mbstring

E: Couldn't find any package by glob 'php8.0-mbstring'

E: Couldn't find any package by regex 'php8.0-mbstring'

Can someone help me figure this out? Why does mbstring not get installed to php8.0, and why can't I install mbstring for 8.0? I have googled online and found guides for installing mbstring for 8.0 and this specific command, but I can't see that extension.