Question

How to install composer 2

Posted on April 15, 2021
Ubuntu 20.04 PHP Ubuntu
Asked by tjeumoonen

Hello

https://www.digitalocean.com/community/tutorials/how-to-install-and-use-composer-on-ubuntu-20-04

how to upgrade to version 2 ?? command, composer self-update --2 , is not defined !!

Also as non root user: file_put_contents(/var/www/mywebsite/vendor/composer/autoload_classmap.php): failed to open stream: Permission denied.

Regards, Tjeu

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Bobby Iliev

Site Moderator

• April 15, 2021

Accepted Answer

Hi there,

In case that you’ve installed composer with apt already you might have to remove the package first and then follow the steps from the tutorial:

Remove the current installation:

sudo apt remove composer

Install the latest version:

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('sha384', 'composer-setup.php') === '756890a4488ce9024fc62c56153228907f1545c228516cbf63f885e036d37e9a59d27d63f46af1d4d07ee0f76181c7d3') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
sudo php composer-setup.php --install-dir=/usr/local/bin --filename=composer
php -r "unlink('composer-setup.php');"

Let me know how it goes. Regards, Bobby

MELVIN GILBERT • December 7, 2023

Uninstall composer:

sudo apt-get remove composer

stackoverflow.com/questions/30396451/remove-composer

Install Composer:

cd ~
curl -sS https://getcomposer.org/installer -o /tmp/composer-setup.php
sudo php /tmp/composer-setup.php --install-dir=/usr/local/bin --filename=composer

https://www.digitalocean.com/community/tutorials/how-to-install-and-use-composer-on-ubuntu-22-04

688456619d23433c8389fee3e2e376 • July 6, 2022

The previous solution (from 15 April 2021) will no longer work.

See instructions on the Composer Download page (and the warning “Please do not redistribute the install code. It will change with every version of the installer.”)

https://getcomposer.org/download/

This worked for me to install Composer version 2.3.9 today in my droplet.