在ubuntu 14.04上，用apt-get install libpostproc52 时出现如下错误：
dpkg: error processing archive /var/cache/apt/archives/libpostproc52_6%3a0.git20120821-4_amd64.deb (--unpack):
libpostproc52:amd64 6:0.git20120821-4 (Multi-Arch: no) is not co-installable with libpostproc52 which has multiple installed instances
E: Sub-process /usr/bin/dpkg returned an error code (1)
解决方法：
sudo dpkg --purge libpostproc52:i386
sudo apt-get -f install 或：apt-get install libpostproc52