Extension gd is missing from your system - laravel composer Update

I have installed php7, I did the following to solve exactly the same error

sudo apt-get install php7.0-gdsudo apt-get install php7.0-intlsudo apt-get install php7.0-xsl

php laravel laravel-5.2 gd

If you are working in PHP version 5.* then you have to install

sudo apt-get install php5-gd

And if you are working in PHP version 7.* then you have to install

sudo apt-get install php7.0-gd

Hope it will work...

And if you are working in PHP version 7.2 then you have to install

sudo apt-get install php7.2-gd... it worked for me

php laravel laravel-5.2 gd

It may not be enabled for php-cli, you can enable like this;

sudo phpenmod gd

UPDATE

I guess, you are using ppa:ondrej php package (5.6), which is confusing you with default ubuntu 14.04 php package (5.5.9).

To install php 5.6 gd library from ppa:ondrej, you should use:

sudo apt-get install php5.6-gd

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