Problem in update,what is the problem in update, err,hit,secure,

General Help
2

Whenever you add a repository, you need to check it first and make sure it is current and maintained.
Part of the trouble with the internet is that many people look up guides that are ten years old, then follow the instructions without ensuring that they apply to their system.
This can often be true on Windows OS too... You wouldn't have much luck using a guide for Windows XP on Windows 11.

The following repositories are ones that you have added that are not current or maintained:

Err:43 http://ppa.launchpad.net/aacebedo/libi3ipc-glib/ubuntu focal Release                                       
  404  Not Found [IP: 185.125.190.52 80]
Err:44 http://ppa.launchpad.net/daniel-marynicz/filemanager-actions/ubuntu focal Release    
  404  Not Found [IP: 185.125.190.52 80]
Err:45 http://ppa.launchpad.net/kgilmer/regolith-stable/ubuntu focal Release                                                 
  404  Not Found [IP: 185.125.190.52 80]
Err:46 http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal Release                                                      
  404  Not Found [IP: 185.125.190.52 80]
Err:47 http://ppa.launchpad.net/rojtberg/sensors-unity/ubuntu focal Release                                                  
  404  Not Found [IP: 185.125.190.52 80]
Err:48 http://ppa.launchpad.net/w-shackleton/droidpad/ubuntu focal Release                                                   
  404  Not Found [IP: 185.125.190.52 80]
Err:49 https://repo.hotspotshield.com/deb/rel/all release InRelease                                                          
  Temporary failure resolving 'repo.hotspotshield.com'
Ign:50 https://ocean.surfshark.com/debian stretch InRelease

Please remove them, then run sudo apt update. You can do a net search for the packages you are looking for in the FOCAL repositories.
Or, you can look for a package you need using pkgs.org and scroll down to Ubuntu 20.04.

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