I'm only 3 weeks old in Ubuntu Studio 20.10, never used LINUX before.
Nvidia drivers are still installed (current is X.org Server), probably why video quality is still not 100%.
For VLC packages, I'd like to remove safely all of them (they bug since install/removal of "win64" with Discover) before reinstall.
To remove those using "sudo dpkg -r", not sure how to format the whole command with pack name and options (remove everything related). The help section is not very clear for me and I haven't checked what the Purge function does.
UPDATE: the answer using "sudo apt remove --purge" worked for Nvidia, didn't need "sudo dpkg". Still looking for the other apps purge removal on the use of "~" (see answer)
Using Discover software manager got buggy results. I need a way to uninstall Discover. Found Discover's name was "plasma-discover", and 4 other packages start with same name adding stuff after a "-".
Also found "update-inetd", don't think I really need: I read it's used to MODIFY the inetd config file, and I only use Firefox for browsing and Thunderbird for mails. I would need to verify the inetd config for possible hacks (won't use ftp or samba (not installed but vlc-plugin-samba is in dpkg list)). Will ask a question about that and remove it from this one when answered.
EDIT: Removed and reinstalled vokoscreenNG using "sudo snap install" and it upgraded from last version 3.0.5 to 3.0.8.
Now has the options I wanted but bugs: using "frame" I can't get drop-down menu to list size (only full screen size lists). It records in adjusted frame but doesn't stop recording, bringing back the voko window yields empty window, solution's to close it. Videos recorded seem ok but log has long error message relating to X.org server + app not keeping previous settings, maybe the Nvidia drivers conflicting with X.org drivers is source of problem? Hope removing Nvidia will fix this.
UPDATE: still working on this one.
sudo apt remove --purge ~nnvidia