Allow specifying the variant for the ubuntu drivers

Signed-off-by: guenthgr <guenther.grill@sensonic.com>

tasks/install-ubuntu.yml

@@ -10,6 +10,6 @@
     state: "{{ nvidia_driver_package_state }}"
     autoremove: "{{ nvidia_driver_package_state == 'absent' }}"
     purge: "{{ nvidia_driver_package_state == 'absent' }}"
-  with_items: "{{ nvidia_driver_ubuntu_packages }}"
+  loop: "{{ nvidia_driver_ubuntu_packages }}"
   register: install_driver
   environment: "{{proxy_env if proxy_env is defined else {}}}"