Add this repository
You should be able to use any of the listed mirrors by adding a line to your /etc/apt/sources.list like this:


deb http://cz.archive.ubuntu.com/ubuntu jammy-updates main universe
Replacing cz.archive.ubuntu.com/ubuntu with the mirror in question.


atualizar pacotes comando sudo apt-get update && apt-get upgrade.


install packettracert comand dpkg -i CiscoPacketTracer822_amd64_signed.deb


this fixed the broken packets in the packetracert 822_amd64_signed.deb installation