Thanks for your help.
I'm not sure why I am on 32bit rather than 64, many years ago I used to run Windows in parallel with Ubuntu. I have a Lenovo-G575 laptop with 2 x AMD C-50 Processors and 3.6GiB Memory.
Sadly, either through my stupidity in these matters, or some other problem, I have had no joy with your suggestions.
After copying & pasting your codes:
After 2nd line of code was installed: For common plugins:
at the end I got
N: Ignoring file ‘getdeb.list.bck’ in directory ‘/etc/apt/sources.list.d/’ as it has an invalid filename extension
After 3rd line Additional (not mentioned in Wiki)
Package nvidia-cuda-toolkit is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or is only available from another source
N: Ignoring file 'getdeb.list.bck' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
E: Package 'nvidia-cuda-toolkit' has no installation candidate
After the 1st line of your code was installed I did get some similar warnings and nothing seems to have changed in regard to still not having the tool...
I tried installing the NVIDIA-Linux-x86-367.35 from Nvidia which has appeared in my "download" box as a "run" file, as has an avidemux_2.6.12.tar.gz box. But I do not know what to do with these boxes? (I did mention needing the "Dummy" version of how to do these things).
Just tried the installation from Avidemux.org again, I can install the GetDeb repository in my Ubuntu Software, but when I try the install button for Avidemux, nothing happens, then the "cannot find" box comes up.
This all seems too complicated! I just clicked "Install" button from Ubuntu Software last time. Why have they taken Avidemux off their list? Guess I'll have to ask Ubuntu about that, but I really miss this great tool, so any further help would be greatly appreciated....
Thanks for your time,