I havent tried installing the CB20A on any versions of linux.But ,as far as i know,you can do that..
In the case of redhat8.0,the procedure will be slightly different from that on redhat7.1.
From version 7.1 and higher ,the procedure is different.
Here is some useful link for you which helps you to understand the procudure to install CB20A on different versions of linux.
http://www.cisco.com/en/US/products/hw/wireless/ps4555/products_installation_and_configuration_guide_book09186a008007f93c.html.
Hope this helps.
