Use an archive Nextcloud actually provides

ec2.yml

@@ -9,7 +9,7 @@
   vars:
     acme_directory: "https://acme-staging-v02.api.letsencrypt.org/directory"
     acme_version: 2
-    nextcloud_targz: "https://download.nextcloud.com/server/releases/nextcloud-18.0.0.tar.gz"
+    nextcloud_tarbz2: "https://download.nextcloud.com/server/releases/nextcloud-18.0.0.tar.bz2"
     website_url: "nc.assburgers.club"
     website_root: "/var/www/nextcloud"
   roles:

roles/nextcloud/tasks/main.yml

@@ -52,11 +52,11 @@
         block:
           - name: Download Nextcloud
             get_url:
-              dest: /var/www/nextcloud.tar.gz
-              url: "{{ nextcloud_targz }}"
+              dest: /var/www/nextcloud.tar.bz2
+              url: "{{ nextcloud_tarbz2 }}"
           - name: Extract Nextcloud
             unarchive:
-              src: /var/www/nextcloud.tar.gz
+              src: /var/www/nextcloud.tar.bz2
               dest: "{{ website_root }}"
               extra_opts: [--strip-components=1]
           - name: Cleanup