How to Add Repository to APT

1. Open a terminal.

2. sudo apt-get -y install lsb-release ca-certificates curl

3. sudo curl -sSL https://repo.pixcept.de/public.key | sudo gpg --dearmor -o /usr/share/keyrings/ispprotect.gpg

4. sudo sh -c 'echo "deb [signed-by=/usr/share/keyrings/ispprotect.gpg] https://repo.pixcept.de/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/ispprotect.list'

5. Update the package list:

   sudo apt-get update

6. Install the desired package:

   sudo apt-get install ispprotect