proc_open(): fork failed - Cannot allocate memory laravel ubuntu

In this article, you will install laravel project in composer to define command then error to display in composer 'proc_open(): fork failed - Cannot allocate memory'.

In this article, you will find the solution for issue:

The following exception is caused by a lack of memory or swap, or not having swap configured
Check https://getcomposer.org/doc/articles/troubleshooting.md#proc-open-fork-failed-errors for details                                                    
[ErrorException]                                   
proc_open(): fork failed - Cannot allocate memory 

first check your swap with this command:

Run Following Commands:

free -m

sudo /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024

sudo /sbin/mkswap /var/swap.1

sudo /sbin/swapon /var/swap.1

It will help you...