L ‘ installation via dpkg ou gdebi se termine , mais viber ne se lance pas

« chown: cannot access ‘/root/Documents/ViberDownloads’: No such file or directory

1 verifier les dependances

ldd viber
libstdc++.so.6: version `GLIBCXX_3.4.20′ not found

G..LIBCXX.. means « gnu libc++ », which we know as libstdc++, a gcc library.
GLIBCXX_3.4.20 is an object from the gcc-4.9.x libstdc++.so.6.0.20
The trick is to find a libstdc++-4.9.x

2 installation gcc 4.9
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.9 g++-4.9