Error

Cannot push Git to remote repository with http/https

return code 22 fatal: git-http-push failed

The website encountered an unexpected error. Please try again later.

This is a generic message. To find the problem refer to server log. (For example : /var/log/apache/error.log on apache)

Probleme 1. Showing /index.php/clean_url_path

Probleme 1.
If you are activated 'Aggregate CSS files' on admin/config/development/performance, Disable it and refresh the page.
If the page display correctly, Probleme is in CSS Aggregation.

This is due to file/folder permission. so drupal cant write twig tempory files.

Change folder owner / permission like:
chown DRUPAL:www-data -R files/* (On debian/Ubuntu)
chown DRUPAL:apache -R files/* (On Redhat/CentOD/Fedors)

This is due to trusted host configuration of the serveur. It can produce when you change the domain name or 'trusted_host_patterns'. To resolve the probleme, add your new domain to the DRUPAL_ROOT/sites/SITE_FOLDER/settings.php (Ex: sites/defaults/settings.php)

As the solution depend on your error, first of all, you must find why drupal crash.

1. First thing is, You must check the serveur error log.
# tail -f /var/log/apache2/error.log

Reson 1 : FollowSymLinks

By default, virtualmin does not support Options +FollowSymLinks (on .htaccess).

Solution 1 : Recommended