adding a "--groups" flag accepting a comma-separeted list of groups to add the created user to

server/iso_files/grub.cfg

@@ -2,6 +2,6 @@ set timeout=5
 terminal_output console
 
 menuentry "Ubuntu Server Live Image" {
-	linux /casper/vmlinuz.efi boot=casper root=LABEL=ISOIMAGE $KERNEL_ARGS
+	linux /casper/vmlinuz.efi boot=casper root=LABEL=ISOIMAGE nomodeset $KERNEL_ARGS
 	initrd /casper/initrd.lz
 }

server/iso_files/loopback.cfg

@@ -2,6 +2,6 @@ set timeout=5
 terminal_output console
 
 menuentry "Ubuntu Server Live Image" {
-	linux /casper/vmlinuz.efi boot=casper iso-scan/filename=${iso_path} $KERNEL_ARGS
+	linux /casper/vmlinuz.efi boot=casper iso-scan/filename=${iso_path} nomodeset $KERNEL_ARGS
 	initrd /casper/initrd.lz
 }

server/modules/adduser.py

@@ -26,6 +26,10 @@ parser.add_argument(
     dest='username',
     action='store',
     required=True)
+parser.add_argument(
+    '--groups',
+    dest='groups',
+    action='store')
 FLAGS = parser.parse_args()
 
 
@@ -38,6 +42,10 @@ def main():
     with open(os.path.join(FLAGS.chroot_path, 'etc', 'sudoers.d', FLAGS.username), 'w') as fh:
       fh.write('%s\tALL=(ALL) NOPASSWD: ALL\n' % FLAGS.username)
 
+  if FLAGS.groups:
+    for group in FLAGS.groups.split(","):
+      module.ExecChroot('adduser', FLAGS.username, group)
+
   if FLAGS.authorized_keys_file:
     dest_dir = os.path.join(FLAGS.chroot_path, 'home', FLAGS.username, '.ssh')
     dest_path = os.path.join(dest_dir, 'authorized_keys')