call to undefined function mb_strimwidth

All mb_* functions are provided by a PHP extension called Multibyte String, internal name mbstring

You probably don't have the extension active or installed. On most Linux distros you can install the package php-mbstring to install and activate this extension.

Apache needs to be restarted afterwards if you are using mod_php

u need to install php-mbstring package try.

check php version

php -v

then check mbstring already install and enable

php -i | grep mbstring

if not installed run this command

sudo apt-get install php-mbstring

if you are php other version example : 7.1, 7.2, 7.0 based on run command like this :

sudo apt-get install php7.1-mbstring 

if you are using nginx server for run laravel .. then check nginx configration file which version u have loaded in conf file..

go to cd /etc/nginx/sites-available and open your configuration file.. if you are loading php7.2 version in nginx conf file..

fastcgi_pass unix:/var/run/php/php7.1-fpm.sock;

then u need to install 7.2 mbstring package..

sudo apt-get install php7.2-mbstring 

and restart apache2 server

 sudo service apache2 restart

Just got this issue, if you are using linux just install the package php-mbstringand restart Apache.

sudo apt-get install php-mbstring
sudo service apache2 restart

If you are using specific PHP version, you may need to run the following:

sudo apt-get install php7.x-mbstring
sudo service apache2 restart

Replace 7.x by the exact PHP version.