wget https://download.cdn.viber.com/cdn/desktop/Linux/viber.deb

sudo dpkg -i viber.deb

sudo apt --fix-broken install

wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl-dev_1.1.1f-1ubuntu2_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1f-1ubuntu2_amd64.deb

sudo dpkg -i libssl-dev_1.1.1f-1ubuntu2_amd64.deb libssl1.1_1.1.1f-1ubuntu2_amd64.deb

rm -rf viber.deb libssl-dev_1.1.1f-1ubuntu2_amd64.deb libssl1.1_1.1.1f-1ubuntu2_amd64.deb