How do I install php7.2-mbstring? (Ubuntu 14.04)

I’m currently running Ubuntu 14.04 on a several year-old droplet. I’ve updated my repos and sources, made sure universe and multiverse are enabled, and yet I’m still having trouble getting mbstring installed on this droplet.

I’ve tried installing php-mbstring, php7.0-mbstring, php7.2-mbstring, and it still turns up with the same error:

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package php7.2-mbstring
E: Couldn't find any package by regex 'php7.2-mbstring'

I’ve tried to find all the resources I can to remedy this. I’ve followed these:

with no progress. I noticed there are a few mirrors in my repo list, could they be in conflict with official Ubuntu archives?

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Hello, @sergeydgr8

Have you tried adding the following channels in the sources.list:

deb bionic main multiverse restricted universe
deb bionic-security main multiverse restricted universe
deb bionic-updates main multiverse restricted universe

Just open /etc/apt/sources.list in your favorite text editor and add the above lines and then run:

sudo apt install php7.2-mbstring

You can also make sure evetyhing else is up to date by running:

sudo apt-get update

Let me know how it goes.

Regards, Alex