Tente isso.
Faça o download de pacotes fictícios:
wget https://dl.dropboxusercontent.com/u/85403877/ubu13-chrome-fix/lib32gcc1_4.7.3-1ubuntu1_all.deb
wget https://dl.dropboxusercontent.com/u/85403877/ubu13-chrome-fix/lib32stdc%2B%2B6_4.7.3-1ubuntu1_all.deb
wget https://dl.dropboxusercontent.com/u/85403877/ubu13-chrome-fix/libc6-i386_2.17-0ubuntu5_all.deb
Em seguida, instale-os:
sudo dpkg -i lib32gcc1_4.7.3-1ubuntu1_all.deb lib32stdc++6_4.7.3-1ubuntu1_all.deb libc6-i386_2.17-0ubuntu5_all.deb
Então você pode instalar o Google Chrome:
sudo dpkg -i google-chrome-stable_current_i386.deb