Nvidia 7300 LE “no device” | “System program problem detected”? Very laggy

Question

Update: Section 1 fixed?

Section 1:

Using: https://stackoverflow.com/questions/32493904/could-not-insert-nvidia-352-no-such-device, I was able to get the kernel to read as using nvidia.

I'm trying to install Ubuntu 15.10 with an Nvidia 7300 LE video card. I installed server. Then I ran sudo ap-get update && sudo apt-get upgrade && sudo apt-get install ubuntu-desktop.

I saw some methods for installing drivers for nvidia cards but none that touched on my card and none that worked for my card.

What is a step-by-step guide to getting my desktop to show up with Unity on it? Right now, if I log in, the screen turns black after a few moments, then I get sent back to login.

Do I need to do something with my blacklist? If-so, how? What driver should I use, please?

Ideally, I could find some method of installing a driver and then getting the system to work properly with that driver. I'd prefer not to go through another full installation procedure.

Update

Going through https://websetnet.com/how-to-install-the-latest-nvidia-drivers-on-ubuntu/.

Step 1:

~$ sudo lspci -vnn | grep -i VGA -A 12
05:00.0 VGA compatible controller: NVIDIA Corporation [GeForce 7300 LE] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: Micro-Star International Co., Ltd. [MSI] 7300LE PCI Express Graphics Adapter [1462:0345]
        Flags: bus master, fast devsel, latency 0, IRQ 30
        Memory at fd000000 (32-bit, non-prefetched) [size=16M]
        Memory at d0000000 (64-bit, prefetchable) [size=250M]
        Memory at fc000000 (64-bit, non-prefetchable) [size=16M]
        Expansion ROM at feae0000 [disabled] [size=128K]
        Capabilities: [60] Power Management version 2
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [70] Express Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [128] Power Budgeting <?>
        Kernel driver in use: nouveau

Step 2:

http://www.nvidia.com/page/geforce_7300.html says "GeForce 7 Series"; http://nvidia.com/drivers says GeForce 7 Series for Linux's driver is 304.

Step 3:

Done and re-done.

Step 4:

I'm not sure if I should be installing 304 AND latest, but that's what I've done (run both):

# 304 driver
$ sudo apt-get install nvidia-334
# install the latest version
$ sudo apt-get install nvidia-current

!Step 5

The last line says Kernel driver in use: nouveau, and it should say Kernel driver in use: nvidia, according to the link.

So, I tried:

modprobe -rv nouveau && sudo modprobe nvidia
!modprobe: ERROR: could not insert 'nvidia_304': No such device

This final line has me completely vexed. I'm positive it's a 7300 LE, which is certainly a 7-series. So, why is terminal lying to me?

[Fix?]: Well, I used https://stackoverflow.com/questions/32493904/could-not-insert-nvidia-352-no-such-device. Now it says the kernel is using nvidia; however, I have the same issue I started with, still (I'll upload a video).

Section 2

After I type in the password at the ubuntu 15.10 login screen, the login dialog disappears, as does the top bar. The mouse cursor is still present....

After a fwe moments, "System program problem detected: do you want to report this problem? Report / Cancel" appears. I reported it.

The PC is running extremely slowly and clunkily. The desktop often turns black. I'm getting crashes for everything I open. It seems like a video card issue, to me. Then, the system restarts itself.