I was able to get packettracer running in a distrobox.
Here are the steps. I have tested them a couple of times on my bluefin system. They reliably work for me:
distrobox-create --name ubuntu2004 --image ubuntu:20.04
distrobox-enter ubuntu2004
sudo apt update
sudo apt install -y \
wget libgl1 libxi6 libxtst6 libnss3 libx11-xcb1 libpulse0 pulseaudio \
libssl1.1 libqt5core5a libqt5gui5 libqt5widgets5 libqt5network5 \
libqt5xml5 libqt5script5 libqt5scripttools5 libqt5multimedia5 \
libqt5websockets5 libqt5svg5 libqt5sql5 libqt5webenginewidgets5 \
libqt5texttospeech5 libqt5printsupport5 libqt5webenginecore5 \
libqt5webchannel5 libqt5positioning5 libqt5quick5 libqt5qml5 \
libqt5networkauth5 qml-module-qtquick2 qml-module-qtquick-controls \
qml-module-qtquick-controls2 qml-module-qtquick-dialogs \
qml-module-qtquick-xmllistmodel qml-module-qt-labs-settings
sudo apt install -y <path to downloaded 8.2.2 packettracer deb file>
packettracer
Hopefully they will for you. 