[Solder not installing]

I am trying to install Solder and it is stuck on "Updating dependencies" It then says "Killed" and ends the script

 

I have composer installed Globally on my Debian VPS. I have tried running as Root and another user

 

When running as root:

/home/TechnicSolder# composer install --no-dev --no-interaction
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Loading composer repositories with package information
Updating dependencies
Killed

When running as other user:

solder@vps169916:/home/TechnicSolder$ composer install --no-dev --no-interaction                       Loading composer repositories with package information
Updating dependencies
Killed