Sljedite postupak, naredbe za Terminal:
1.
wget -O viber.deb http://download.cdn.viber.com/cdn/desktop/Linux/viber.deb
2.
sudo dpkg -i viber.deb
3.
sudo apt-get install -f
4.
wget http://mirrors.kernel.org/ubuntu/pool/main/g/gcc-5/libstdc++6_5.4.0-6ubuntu1~16.04.11_amd64.deb
5.
dpkg -x libstdc++6_5.4.0-6ubuntu1~16.04.11_amd64.deb /tmp/stdc
6.
sudo cp /tmp/stdc/usr/lib/x86_64-linux-gnu/libstdc++.so.6* /opt/viber/lib
7.
sudo apt-get install libqt5gui5