Today I decide to install just Ubuntu 7.10 on my laptop Compaq 3412. But I got a little problem when i tried to install Adobe Flash Player using Synaptic Package Manager.

The error message was like this:
Download done.
md5sum mismatch install_flash_player_9_linux.tar.gz
The Flash plugin is NOT installed.

So I’m trying to googling to find out what the problem is.  And this is the solution.

1. First, you have to remove the current Adobe Flash Player. You can use this command:
koro@koro-compaq:~/sw$ sudo apt-get remove flashplugin-nonfree

2. Then running this command
koro@koro-compaq:~/sw$ wget -b -c –tries=0 http://launchpadlibrarian.net/10761023/flashplugin-nonfree_9.0.115.0ubuntu2_i386.deb

3. Also give the third command
koro@koro-compaq:~/sw$ sudo dpkg -i flashplugin-nonfree_9.0.115.0ubuntu2_i386.deb

4. After you issued third command above, you will get this message from system:
Download done.
Flash Plugin installed.

Using these 4 steps, you can use flash player without any problem.