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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.

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    The php8.0-mbstring is provided from this repository : launchpad.net/~ondrej/+archive/ubuntu/php Commented May 13, 2021 at 19:31
  • Thank you for that information. Would that mean I don't use 'apt install php8.0-mbstring'? What would I have to do instead? All the links I click on google tell me to do that same command. Commented May 13, 2021 at 19:46
  • It worked! I had to read that document a bit to figure out what you mean. Thanks! Posting the answer as a full comment below. Commented May 13, 2021 at 19:55

2 Answers 2

Reset to default
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Figured it out thanks to Michal Przybylowicz's comment.

The website's repository: https://launchpad.net/~ondrej/+archive/ubuntu/php needs to be added to Ubuntu's package system. The site lists the commands to do:

sudo add-apt-repository ppa:ondrej/php sudo apt-get update

I also did:

sudo add-apt-repository ppa:ondrej/apache2

since I run apache2. After that Laravel said that I need the 'dom' extension as well. That was solved by:

sudo apt install php8.0-dom

After that Laravel finally installed! Thanks Michal!

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  • I am a bit skeptical, can this repo be trusted? Commented May 13, 2021 at 21:57
  • Few months later, everything seems to be fine. So far I see no reason to doubt that repository. Commented Oct 22, 2021 at 16:46
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    @Teso Ondrej appears to be the official Debian package manager for PHP. Commented Dec 10, 2021 at 17:05
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@kush solution worked great for me - after +4 hours of trying stuff.

Obviously, also works if you get this errors:

curl

PHP Warning: PHP Startup: Unable to load dynamic library 'curl' (tried: /usr/lib/php/20200930/curl (/usr/lib/php/20200930/curl: cannot open shared object file: No such file or directory), /usr/lib/php/20200930/curl.so (/usr/lib/php/20200930/curl.so: cannot open shared object file: No such file or directory)) in Unknown on line 0

sudo apt install php8.0-curl or sudo apt install php[your-version]-curl

mbstring

PHP Warning: PHP Startup: Unable to load dynamic library 'mbstring' (tried: /usr/lib/php/20200930/mbstring (/usr/lib/php/20200930/mbstring: cannot open shared object file: No such file or directory)

sudo apt install php8.0-mbstring or sudo apt install php[your-version]-mbstring

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