1. libstdc++6 (>= 4.8.0): This is the GNU standard C++ library. Chrome releases 50.X and up depend on version 4.8.0 of this library, but Ubuntu 12.04 only comes with 4.6.3 by default.

2. lsb-base (>= 4.1): This is the Linux Standard Base package. It indicates the distribution's compliance with a set of standards set by the Linux Foundation. Chrome releases 50.X+ require compliance with the standards defined in LSB base 4.1, but Ubuntu 12.04 is only compliant with 4.0.

由于Ubuntu12.04 只支持4.6.3 ，因此不能解决4.8.0以上的依赖关系，故不能安装更新