Linux 2.2 etc. relate to specific Linux Kernel versions, much older than those generally used by more 'modern' Linux Distros most users will be familiar with.
Oracle is specifically for supported Oracle Linux Distros.
LPIII wrote:What if I ever have to change one after I installed the guest OS? Should I delete it and start new?
There have been times where changing the template (VM General settings, Basic tab, Type & Version dropdowns) has been recommended on the forum and the problem was fixed. But results may be different in any situation.