Question: My end goal is that I want to wipe all of Ubuntu off my computer completely and run Windows 10 solely. Right now I have both of them on my system, but I am unable to get to the Windows 10 login screen because I'm greeted with "Error: Unknown filesystem" and enters me into grub rescue>. I'm not sure how to continue from here to the Windows 10 login screen, and how I can completely remove Ubuntu from my system.

Answer: 
Using Pipelight worked beautifully for me. It only runs in Firefox, though.

**Installing Pipelight**

Open up the old terminal (`Ctrl`+`Alt`+`T`) and copy and paste the following commands. To paste into the terminal do `Ctrl`+`Shift`+`V`.

```
sudo add-apt-repository ppa:pipelight/stable

```

After adding the PPA, update the sources with

```
sudo apt-get update

```

Next, you have to install Pipelight.

```
sudo apt-get install --install-recommends pipelight-multi

```

Then, run the below command to update the plugin.

```
sudo pipelight-plugin --update

```

**Configuring Pipelight**

You may have to remove adobe-flashplugin, but I personally did not need to due to it not being installed.

```
sudo apt-get remove adobe-flashplugin

```

Then enable all of the necessary plugins

```
sudo pipelight-plugin --enable flash

```

Go one-by-one to ensure you're accepting each's license agreement

```
sudo pipelight-plugin --enable widevine

```

Finally:

```
sudo pipelight-plugin --enable silverlight

```

Then update Pipelight to recognize these plugins.

```
sudo pipelight-plugin --update

```

Finally, you must add the plugins to Firefox.

```
sudo pipelight-plugin --create-mozilla-plugins

```

**Testing it out!**

If done correctly, Pipelight should have installed an update version of Flash, Silverlight, and Widevine, which it runs through Wine, as can be seen in the Plugins section of the Add-ons Manager.

[![Firefox plugins with up to date Flash, Silverlight and Widevine](https://i.stack.imgur.com/zKzh4.png)](https://i.stack.imgur.com/zKzh4.png)

Finally, open up Firefox and test 'er out.

[![HBO NOW on Ubuntu](https://i.stack.imgur.com/qxMdA.jpg)](https://i.stack.imgur.com/qxMdA.jpg)

Source: <https://www.maketecheasier.com/watch-hbo-now-ubuntu/>
I believe you need to install the "hal" package (short for Hardware Abstraction Layer; it allows certain DRM-protected Flash content to verify what hardware device it's being played on, to prevent piracy)

Open a terminal (Alt-Ctrl-T) and add Martin Wimpress's HAL PPA (he's the developer behind Ubuntu MATE):

```
sudo add-apt-repository ppa:flexiondotorg/hal-flash

```

Then update your package listing:

```
sudo apt update

```

and install hal:

```
sudo apt install libhal1-flash

```

Then, to make sure Flash is aware of the changes:

```
cd ~/.adobe/Flash_Player

rm -rf NativeCache AssetCache APSPrivateData2

```

Adobe does provide an online test to see if DRM in your player is working. The URL is <http://drmtest2.adobe.com:8080/SVP/SampleVideoPlayer_FP.html> , and you can test it by entering the following URL into the "video URL" box on that page: <http://drmtest2.adobe.com:8080/Content/anonymous.f4v>

Please let me know if this was helpful, or if you ran into any issues!