i am trying to download adobe flashplayer and everytime i click on the download thing it says like this manager thing wont open and i dont know how to download it.

What is the output of:

lsb_release -a; uname -a; dpkg -l | egrep 'flash|gnash|swf'

Thanks

Open package manager and download it from repositories. 11.0.152 is available up from Lucid (10.04).
http://packages.ubuntu.com/search?suite=default&section=all&arch=any&searchon=names&keywords=flashplugin-installer

You need to enable partner repo in software-sources.
https://help.ubuntu.com/community/Repositories/Ubuntu#Adding_Canonical_Partner_Repositories

Leave firefox closed during installation and in case remove all other installed flash applications, otherwise it won't recognize the new version.

Actually, you do not need to enable the partner repository. That is one way (enabling the partner repository for your Ubuntu release and installing the package called adobe-flashplugin). The other way is to install the package called flashplugin-installer (or flashplugin64-installer, under some circumstances), for which the multiverse repository must be enabled.

And then, you also have the option of using alternative, free open source flash plugins, like gnash, swfdec, or lightspark.

I recommend following actionparsnip's advice rather than rushing into any of the above. The information you provide will tell us what Flash plugins, if any, are currently installed, to help us give advice that tells you how to install Flash in a way that is likely to work. (Having two or more Flash plugins installed or enabled at once tends to prevent Flash from working correctly.)