How to unlock the Shield Tablet/K1 bootloader on Linux.

I just spent several hours wasting time, so I want to make this guide to help other people so that they don't have to.

DISCLAIMER
I am not responsible if this breaks your tab. If your tab does break, I might be able to help you. By following this guide, you are agreeing that I cannot be held responsible for anything that happens. Unless your bootloader unlocks. I might could be help repsonsible for that.

Post-unlock
You may want to backup your data, as unlocking the bootloader will erase all user data&apps. A good backup tool is Helium Backup. Find it on the Play store. The free version is fine.
First
Install adb and fastboot from the repos. You won't need the drivers if you are using Linux.
SecondOptional
Enable USB debugging. This isn't required, but can speed up the next step.
Third
Boot tablet into bootloader mode. This can be done two different ways.
A
Power off the tablet in any way. Then, press and hold power+volume_down. When the screen turns on, you can release then.
B
If you enabled USB debugging, then connect your tablet to your pc and authorize the computer. Then, open a terminal and type:

Code:

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adb reboot bootloader

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This will reboot the device to the bootloader.
Fourth
Make sure that fastboot has recongized your device by typing:

Code:

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sudo fastboot devices

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This is where the problem can happen. If you don't sudo the command, it will show a device with "no perms." That can be rather confusing. If you try to use fastboot for anything else, it will show "waiting for device."
Fifth
Now type

Code:

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fastboot oem unlock

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There will be a choice on the device to unlock the bootloader or to leave it locked. Navigate to the unlock and select it. THIS WILL ERASE ALL DATA ON THE DEVICE.
Sixth
You should be at the bootloader menu. It should say: Device-Unlocked
You should be finished.

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