LAMP PHP configuration

Try following command:

sudo apt-get install php-mbstring
sudo apt-get install php-xml

Sometimes the problem is the php-xml extension.

Try:

sudo apt-get install php-xml

If still facing the issue then try

sudo apt-get install -y php7.1 php7.1-xml php7.1-mysql php7.1-curl php7.1-mbstring

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