So, I'm leaving a list of steps for those who want to install Packet Tracer 8.2+ in the future.

It is a combination of user "aut0exec", here on the forums, steps from Packet Tracer 7.2 (https://dev1galaxy.org/viewtopic.php?id=2532)
and SYSNETTECH author, Tolga Bagci's guide about installing Packet Tracer 8.2+ for Debian 11 and 12 (https://www.sysnettechsolutions.com/en/ … an/#jump-1)

1) Download Packet Tracer 8.2 "deb" file for Ubuntu OS. You have to enroll to Packet Tracer course in order to see the link about downloading
    the packet.

2) Open the terminal and "cd" to your folder where you downloaded the "deb" file, ex. /home/john/Downloads

3) Then run "sudo dpkg -i Packet_name_here.deb".

4) Press "OK" on the message about EULA and then "YES" about accepting.

5) You will see that there are some dependences, that where not installed. Run "sudo apt install -f" in order to force install them.

6) Either run "packettracer" from terminal or there will be a new entry on the main menu under "other".

7) If you get an error "/usr/local/bin/packettracer: line X: XXXX Aborted     ./PacketTracer "$@" > /dev/null 2>&1"
    then you are missing critical qt5 dependencies and need to install them anew.

8) Thanks to aut0exec, you can run "sudo apt-get install libqt5x11extras5 libqt5multimedia5 libqt5webkit5" and
    install all packages and their dependencies. After that it will work just fine!