Install PacketTracer 8.2.1 on Linux Mint 21
Download PacketTracer from an official Cisco location (e.g Netacad.com, Skillsforall.com) and save it to disk (here: "Downloads")
Right-click on an empty space in the "Nemo" file manager and select "Open in Terminal".
Install the .deb package using the "apt install" command with the relative path to the package file. APT will recognize it and install the package along with its dependencies, if any.
Read the license agreement :p and select "OK".
Accept the terms.
Ignore the "Notice" warning at the end of the installation. All went well.
Member of Cisco Network Academy? You should have received an activation link on your private e-mail. Activate your account.
Select "Menu" and start typing "pac". Start "PacketTracer 8.2.1".
First choose "Keep me logged in (for 3 months) and then select "Cisco Networking Academy".
First accept "cookies" and then login with your private e-mailadress and password.
Personal preference here. Select "Options -> Preferences -> Font". Increase the fontsize to 12 and click "Apply". Then close the window.