how to avoid cheking sum on installing package

Hi,
I tried to install flashplugin-nonfree on sidux

apt-get install flashplugin-nonfree

but I got the error (md5sum mismatch), I want to avoid the checking

  here is the error

2550K .......... .......... .......... .......... .......... 87%   11.11 MB/s
 2600K .......... .......... .......... .......... .......... 89%   11.26 MB/s
 2650K .......... .......... .......... .......... .......... 91%   10.76 MB/s
 2700K .......... .......... .......... .......... .......... 92%   11.28 MB/s
 2750K .......... .......... .......... .......... .......... 94%   10.78 MB/s
 2800K .......... .......... .......... .......... .......... 96%   10.72 MB/s
 2850K .......... .......... .......... .......... .......... 97%   11.06 MB/s
 2900K .......... .......... .......... .......... .......... 99%   11.25 MB/s
 2950K .......... ....                                       100%   11.43 MB/s

15:33:28 (9.94 MB/s) - « ./install_flash_player_9_linux.tar.gz » sauvegardé [3036127/3036127]

Download done.
md5sum mismatch install_flash_player_9_linux.tar.gz The Flash plugin is NOT installed.

thanks for help Received on Sun Dec 23 10:07:13 2007