Composer - the requested PHP extension mbstring is missing from your system - Stack Overflow

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Wed May 20 2020 13:00:31 GMT+0000 (Coordinated Universal Time)

Saved by @Muhamad FKH. 

sudo apt-get install php-mbstring

# if your are using php 7.1
sudo apt-get install php7.1-mbstring

# if your are using php 7.2
sudo apt-get install php7.2-mbstring
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https://stackoverflow.com/questions/32488917/composer-the-requested-php-extension-mbstring-is-missing-from-your-system