1. download and install cksfv which is no longer in the repository
sudo dpkg -i cksfv_1.3.5-1_i386.deb
2. verify files listed in .sfv
cksfv -f filename.sfv
sudo dpkg -i cksfv_1.3.5-1_i386.deb
cksfv -f filename.sfv
wget http://linuxdesktop.cn/downloads/gsopcast/gsopcast_0.3.1-1_i386.deb
sudo dpkg -i gsopcast_0.3.1-1_i386.deb # -i is equal to --install