Installing Steam on Ubuntu 15.04 fails repeatedly

What is the output of:

sudo lshw -C display

Thanks

output from:
    sudo lshw -C display

   *-display
            description: VGA compativle controller
             product: G96 [GeForce 9400 GT]
             vendor: NVIDIA Corporation
             physical id: 0
             bus info: pci@0000:02:00.0
             version: a1
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
             configuration: driver=nouveau latency=0
             resources: irq: 47 memory: df000000-dfffffff memory: c0000000-cfffffff memory:dc000000-ddffffff
                                        ioport:ec00(size=128) memory:def80000-defffff

Hope this can lead to a solution. Thank you.

doh - in the first line it says compatible controller NOT compativie ... sorry, typo first thing this morning.

Thank you again for any help you can give.

Install the Nvidia driver using the additional drivers application

Did the install you suggested, and after rebooting my computer (twice)
Ubuntu 15.04 login screen showed & asked for my password.

Entered my user password and got an 'incorrect password' message.

Tried entering my administrator password and Ubuntu 15.04 seems to accept
the password, starts to open the desktop and then reverts / switches back
to the login screen.
What step might be next???
On Apr 26, 2015 8:06 AM, "actionparsnip" <
<email address hidden>> wrote:
>
> Your question #265888 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/265888
>
> Status: Open => Answered
>
> actionparsnip proposed the following answer:
> Install the Nvidia driver using the additional drivers application
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
> https://answers.launchpad.net/ubuntu/+question/265888/+confirm?answer_id=3
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/ubuntu/+question/265888
>
> You received this question notification because you asked the question.

Still having problems, but now it's changed to Ubuntu 15.04 installation
has some how changed or altered my user / administrator passwd.
On Apr 26, 2015 12:36 PM, "Micheal Leroy Rainwater" <
<email address hidden>> wrote:
>
> Your question #265888 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/265888
>
> Status: Answered => Open
>
> You are still having a problem:
> Did the install you suggested, and after rebooting my computer (twice)
> Ubuntu 15.04 login screen showed & asked for my password.
>
> Entered my user password and got an 'incorrect password' message.
>
> Tried entering my administrator password and Ubuntu 15.04 seems to accept
> the password, starts to open the desktop and then reverts / switches back
> to the login screen.
> What step might be next???
> On Apr 26, 2015 8:06 AM, "actionparsnip" <
> <email address hidden>> wrote:
> >
> > Your question #265888 on Ubuntu changed:
> > https://answers.launchpad.net/ubuntu/+question/265888
> >
> > Status: Open => Answered
> >
> > actionparsnip proposed the following answer:
> > Install the Nvidia driver using the additional drivers application
> >
> > --
> > If this answers your question, please go to the following page to let us
> > know that it is solved:
> >
https://answers.launchpad.net/ubuntu/+question/265888/+confirm?answer_id=3
> >
> > If you still need help, you can reply to this email or go to the
> > following page to enter your feedback:
> > https://answers.launchpad.net/ubuntu/+question/265888
> >
> > You received this question notification because you asked the question.
>
> --
> You received this question notification because you asked the question.

http://www.psychocats.net/ubuntu/resetpassword

Which of the NVIDIA drivers?

There is a list of 5 different ones, including the X one that comes with 15.04;

and every one I have installed results in the login problem I mentioned already.

I've gotten the desktop to work by using:

    sudo apt-get remove NIVIDA.*

and rebooting the computer.

But I'm back to the original problem now, Steam Launcher just will not install Steam on Ubuntu 15.04 and to add to the problem all the games I had paid for have disappeared as well.

This question was expired because it remained in the 'Open' state without activity for the last 15 days.