Pour opensocial, il est nécessaire de passer à PHP 7.1 minimum, mais :

https://www.virtualmin.com/node/58700

https://www.virtualmin.com/comment/reply/58935

<code>besseges@ns1:~$ composer create-project goalgorilla/social_template:dev-master social-8.x-3.3.1  --no-interaction
Installing goalgorilla/social_template (dev-master 6d6a359644812fcd12b20e4f03ae453585cf5b34)
  - Installing goalgorilla/social_template (dev-master master): Cloning master from cache
Created project in social-8.x-3.3.1
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for doctrine/annotations v1.6.0 -> satisfiable by doctrine/annotations[v1.6.0].
    - doctrine/annotations v1.6.0 requires php ^7.1 -> your PHP version (7.0.30) does not satisfy that requirement.
  Problem 2
    - Installation request for symfony/debug v4.1.6 -> satisfiable by symfony/debug[v4.1.6].
    - symfony/debug v4.1.6 requires php ^7.1.3 -> your PHP version (7.0.30) does not satisfy that requirement.
  Problem 3
    - symfony/debug v4.1.6 requires php ^7.1.3 -> your PHP version (7.0.30) does not satisfy that requirement.
    - symfony/console v3.4.17 requires symfony/debug ~2.8|~3.0|~4.0 -> satisfiable by symfony/debug[v4.1.6].
    - Installation request for symfony/console v3.4.17 -> satisfiable by symfony/console[v3.4.17].</code>