mysql> select display_name,count(1) as count from guest_os group by display_name having count >1;
+------------------------------+-------+
| display_name | count |
+------------------------------+-------+
| SCO OpenServer 5 | 2 |
| Ubuntu 20.04 LTS | 2 |
| Debian GNU/Linux 11 (64-bit) | 2 |
| Debian GNU/Linux 11 (32-bit) | 2 |
| CentOS 9 | 2 |
| Oracle Linux 9 | 2 |
+------------------------------+-------+
6 rows in set (0.00 sec)