Opera 8 with Knoppix 

I reecently installed the latest Knoppix ISO and I can not install Opera - 
up to now, for all previous versions, I had downloaded the static RPM
Opera file and double-clicked it and the install was done right away.

On the latest vesion of Knoppix,trying to install Opera 8 static rpm file,
I get the message set:
rpm: to install rpm pavckages on Debian sysyetms, use alien.
error: cannot open Packages using db3 - no such file or directory
error: cannot open Packages database in /var/lib/rpm

Help (please don't throw answer with the assumption that I am highly
conveservent in Linux commands and processes).

Thanks.

Thank you for your question. 

However, I believe that to answer it well, your question will require
more time and effort than the average amount of time and effort
associated with this price. Here is a link to guidelines about pricing
your question, in the pricing guide:
https://answers.google.com/answers/pricing.html

I received a very quick response to my question on the Opera forum, linux category.
No charge for the help.