Kubuntu 22.04 has libssl 3.0.2, that is not compatible with libssl from old releases, so Viber messenger is not working. It shows an error message “No Connection” even the other network apps like Firefox work well. I think this bug will be fixed in future Viber versions. For now, it’s possible to perform a hotfix:
Install libssl 1.2.1 from Ubuntu 21.10:
wget http://security.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1l-1ubuntu1.2_amd64.deb
sudo dpkg -i libssl1.1_1.1.1l-1ubuntu1.2_amd64.deb
Preload libssl 1.2.1 into Viber. Replace line that contains Exec instruction in
/usr/share/applications/viber.desktop with this:
Exec=LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libssl.so /opt/viber/Viber %u