- Edited
Palladiniu I copied and pasted the commands you posted and my Machine throws up an error every time I tried it
Then there's something wrong with your setup. (1) sudo is a standard UNIX/Linux command, and (2) kdenlive is present in the Solus repository. Here's the result when I search for it:
# eopkg sr kdenlive
kdenlive - Video editing application, based on MLT Framework and KF5
kdenlive-dbginfo - Debug symbols for kdenlive
This might be a good time to check to be sure your Solus installation is complete and up-to-date.
EDIT: It would help others to help you if you'd post the errors that your machine "throws up" every time you try to use these common commands. They may provide the clues that will help someone to help you.