One blue screen appears running a internet speed test: do i need a missing plugin ?

Does

http://speedtest.net

work ok?

At above link I got the below results-

Welcome to Speedtest.net! If you are seeing this error message it could be due to one or more of the problems listed below, together with potential solutions.

    Be sure to enable JavaScript. Here's how: http://enable-javascript.com/.
    Have Flash v.10+? If you do, try uninstalling Flash. Either way, get the latest Flash client here.
    Still no luck? Sorry. You can either visit our Support section to troubleshoot further or try our non-JavaScript site. Unfortunately you still need Flash v10+ and there is no guarantee everything will work correctly!

Please visit again when you are able to use Flash (v.10+) and JavaScript but take a moment to learn more about Speedtest.net.
-How to get the same and how to know whether they are already there.

Can you give the output of:

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

Thanks

The output is as under-
No LSB modules are avaiplable.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.1 LTS
Release: 12.04
Codename: precise
Linux luckyvicky 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
ii browser-plugin-gnash 0.8.10-5ubuntu1 GNU Shockwave Flash (SWF) player - Plugin for Mozilla and derivatives
ii flashplugin-installer 11.2.202.238ubuntu0.12.04.1 Adobe Flash Player plugin installer
ii gnash 0.8.10-5ubuntu1 GNU Shockwave Flash (SWF) player
ii gnash-common 0.8.10-5ubuntu1 GNU Shockwave Flash (SWF) player - Common files/libraries

sudo apt-get --purge remove browser-plugin-gnash gnash gnash-common flashplugin-installer

sudo apt-get update

gksudo gedit /etc/apt/sources.list

Find these lines:

#deb http://archive.canonical.com/ubuntu precise partner
#deb-src http://archive.canonical.com/ubuntu precise partner

and remove the hash character (If they haven't already been removed)

Save the new file, close gedit and run:

sudo apt-get install adobe-flashplugin

Close all web browsers and rerun to load the new plugin, should be ok

I got the following outcome-

Reading package lists... Done
Building dependency tree
Reading state information... Done
Package adobe-flashplugin is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Type 'See' is not known on line 6 in source list /etc/apt/sources.list
E: The list of sources could not be read.
E: Package 'adobe-flashplugin' has no installation candidate

Can you give the output of:

grep -R part /etc/apt/*

What is output?

Thanks

After previous I got problem with update manager, the outcome of 'sudo apt-get update' is as mentioned below and one red circle with '-' minus sigh is appearing on the top of my screen.

E: Type 'See' is not known on line 6 in source list /etc/apt/sources.list
E: The list of sources could not be read.

Now the outcome of commands given at #7 is as under-
/etc/apt/sources.list:'partner' repository.
/etc/apt/sources.list:This software is not part of Ubuntu, but is offered by Canonical and the
/etc/apt/sources.list:deb http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list:deb-src http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list:This software is not part of Ubuntu, but is offered by third-party
/etc/apt/sources.list~:'partner' repository.
/etc/apt/sources.list~:This software is not part of Ubuntu, but is offered by Canonical and the
/etc/apt/sources.list~:deb http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list~:deb-src http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list~:This software is not part of Ubuntu, but is offered by third-party
/etc/apt/sources.list.save:## 'partner' repository.
/etc/apt/sources.list.save:## This software is not part of Ubuntu, but is offered by Canonical and the
/etc/apt/sources.list.save:# deb http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list.save:# deb-src http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list.save:## This software is not part of Ubuntu, but is offered by third-party
grep: /etc/apt/trustdb.gpg: Permission denied

Thanks , I hope I will come out with this new problem. In gedit file I think I had removed all # signs.

Dear Sir , Thanks a lot. Also speedtest.net is also working very nice I got the required plugin. Thanks

Thanks actionparsnip, that solved my question.