Quote Originally Posted by fingers99
You really shouldn't try dist-upgrade on Knoppix. If you proceed, you will almost certainly break stuff big style. See the top of your /etc/apt/sources.list for a safer (no guarantees) way to proceed.
....
# Remember that you can only use http, ftp or file URIs
# CDROMs are managed through the apt-cdrom tool.
Could anybody help? I am not sure where to look for this thing...
I do upgrade KNOPPIX packages at my persistent home and now find a problem:
Some of these packages come upgraded inside the Knoppix new DVD. But I can't see them since I have the old ones installed.

Through "fingers99" answers, I guess that there should be a way of telling apt-get to consider upgrading from the DVD (apt-cdrom). Or better, telling me what local packages in my persisten home should be upgraded and allow me to erase them in order to be able to use the DVD ones...

Am I right? Have anyone solved this problem?
Could Synaptic help to do this?
This should be the main problem of using a Live DVD:
Difficulties with dealing with the manually upgraded applications when using a new Knoppix version
Besides this, it is far better than any installed LINUX distribution.

I feel myself so close to the solution, that I know that sooner or later I am going to find the answer.
But if somebody has solved this before, I would be thankful to listen to it and learn something.

Thank you in advance
Alberto