[Manually Solved] dependency problems under Debian (Trixie/Testing)

[Sadi58]

Clicking the downloaded file "whatsapp-for-linux_1.6.5_amd64.deb" failed to install under Debian Trixie/Testing and KDE Plasma 5.27.11 due to unmet dependencies.
The dependency in question was "gstreamer1.0-plugins-bad" and it is no longer available in Debian repositories.
So I installed "gstreamer1.0-plugins-ugly" instead, just in case, although it posed a "dependecy-version" problem, which I overcame with the command "sudo dpkg -i ----force-depends-version ", and then used the command "sudo dpkg -i ---force-depends" for "whatsapp-for-linux_1.6.5_amd64.deb"
Finally, I also needed to edit the file "/var/lib/dpkg/status" and remove "gstreamer1.0-plugins-bad".
The app now works again - only with at that minor issue of tray-attention icon not remaining until the new messages are read.