I tried to install flashplugin , I got md5 error, Desktop# dpkg -i flashplugin-nonfree_10.0.12.36ubuntu1_i386.deb 2009-01-15 20:15:35 (15.6 KB/s) - `./install_flash_player_10_linux.tar.gz' saved [3962157/3962157] Download done. md5sum mismatch install_flash_player_10_linux.tar.gz The Flash plugin is NOT installed. Processing triggers for man-db ... If the problem remains even I change site, how to disable the chking sum thanks for help