diff --git a/debian/postinst b/debian/postinst
index 6f9c6ff4ba..c08d2d5a09 100755
--- a/debian/postinst
+++ b/debian/postinst
@@ -151,17 +151,20 @@ EOF
       ucf --debconf-ok --three-way ${gitlab_debian_conf_private} ${gitlab_debian_conf}
       ucfr gitlab ${gitlab_debian_conf}
 
-      if test -f ${nginx_conf_example}; then
-        nginx_site="/etc/nginx/sites-available/${GITLAB_HOST}"
-        sed -e "s/YOUR_SERVER_FQDN/${GITLAB_HOST}/"\
-        ${nginx_conf_example} >${nginx_site_private}
-	ucf --debconf-ok --three-way ${nginx_site_private} ${nginx_site}
-	ucfr gitlab ${nginx_site}
-        ln -fs ${nginx_site} /etc/nginx/sites-enabled/
-        rm -f ${nginx_conf_example_tmp}
-      else
-        echo "nginx example configuration file not found"
-        exit 1
+      # configure nginx site
+      if test -d /etc/nginx/sites-available/; then
+        if test -f ${nginx_conf_example}; then
+          nginx_site="/etc/nginx/sites-available/${GITLAB_HOST}"
+          sed -e "s/YOUR_SERVER_FQDN/${GITLAB_HOST}/"\
+          ${nginx_conf_example} >${nginx_site_private}
+          ucf --debconf-ok --three-way ${nginx_site_private} ${nginx_site}
+          ucfr gitlab ${nginx_site}
+          ln -fs ${nginx_site} /etc/nginx/sites-enabled/
+          rm -f ${nginx_conf_example_tmp}
+        else
+          echo "nginx example configuration file not found"
+          exit 1
+        fi
       fi
       # Reload nginx
       if command -v nginx > /dev/null; then