Linux on Tablets

[last updated: 2022-02-22]
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I have a couple of tablets that are effectively useless.
One was part of my phone bundle from an old (now closed) Verizon account, It is an LG VK810 4G
The other is a ...

I want to put Linux on them.
To Root or not:
- "To Root" is to gain root account access to all folders and directories on your device.
  This allows system modifications that would otherwise be unavailable.
- Linux can be installed on a device whether it is rooted or not.
- The process of gaining root access can be difficult, is different for different devices, and can fail, leaving your device un-usable.
- Rooting voids manufacturer's warranty.
- from ref-4: "...your device could be prone to security issues, so it's worthwhile to download a robust security app, such as 360 Mobile Security or Avast! to stay on the safe side. "
- Rooting is reversible.
- Rooting requires that the bootloader be unlocked
- Software to root:
  - KingRoot
  - KingoRoot
  - TowelRoot
  - Magisk
  - Framaroot
  - RootGenius
  - Odin (for Samsung)
  - see also: XDA Developers Forum, ref-5 below.
Install Linux on unrooted device:
https://www.how2shout.com/how-to/how-to-install-ubuntu-linux-on-android-...
https://linuxhint.com/install_linux_android_without_root/
https://fossbytes.com/how-to-install-a-linux-on-android-phone-without-ro...
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LG VK810:
- One link below suggests I need to download a USB driver to my PC in order to connect to and communicate with the LG.
  However even before attempting such a download, and with a fresh install of Linux Mint 20.3, connecting the PC to the LG with a micro-USB cable seemed to sort of work,
  that is, it initially connected, but then disconnected after a few seconds.
- Enable USB debugging:
  from main screen: menu icon (3 horiz bars, bottom right of screen
  Settings --> About Tablet
  Software information panel opens
  touch "Build number" 7x
  prompt will say something like "You are now a developer"
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from ref-2:
Can You Run Linux on Android?
With apps like UserLAnd, anyone can install a full Linux distribution on an Android device. You don't need to root the device, so there's no risk of bricking the phone or voiding the warranty.
With the UserLAnd app, you can install Arch Linux, Debian, Kali Linux, and Ubuntu on a device. The program installs an additional layer on the device that runs the chosen version of Linux, allowing you to connect to a Linux session using SSH or VNC with the assistance of the bVNC app.
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from xda:
After spending 3 days searching on the net, I found the way :
"Just purchased a LG G4 (H815). I'm in the process of unlocking the bootloader, and have been following LG's official instructions. However, I am having trouble performing step 8 of this guide:
"Enable OEM unlock on your phone. Activating the "Enable OEM unlock" is necessary for the bootloader unlock. To enable OEM unlock, go to Settings >> Developer options and check Enable OEM unlock."
Going into developer options and tapping on "Enable OEM unlock" returns the pop up message "WARNING: Device protection features will not work on this device while this setting is turned on. CANCEL ENABLE". After checking ENABLE, the pop up goes away, and I can see the checkmark box is checked for less than a second, and then it goes back to being unchecked on its own. Can anyone explain this?
Also, if instead of tapping CANCEL or ENABLE on the pop up, I click off of the pop up, the pop up goes away and the box will stay check marked until I interact with something else. Entering adb reboot bootloader from here though still does nothing sadly.

UPDATE: I had to download LG Bridge, connect my phone and use LG Bridge to search for a software update (H81520H) that my LG G4's update center was not finding for some reason. After the update, I had an update android security patch level, and could enable my OEM Unlock!"

https://forum.xda-developers.com/t/unlock-unofficial-g4-unlock-any-lg-g4...

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