Install the Linux Subsystem on Windows 10 - Microsoft Docs
https://docs.microsoft.com/en-us/windows/wsl/install-win10
Enable the "Windows Subsystem for Linux" optional feature and reboot.

Open PowerShell as Administrator and run:
Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux
Restart your computer when prompted.

Change "sudo visudo" editor (select /usr/bin/vim.basic):
sudo update-alternatives --config editor

sudo visudo adjustment:
%sudo ALL=(ALL:ALL) NOPASSWD: ALL

Linux root file system location on C: drive:
C:\Users\(your_user_account)\AppData\Local\Packages\CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc\LocalState\rootfs

Mount another drive:
sudo mkdir /mnt/z
sudo mount -t drvfs Z: /mnt/z

ssh-add key adding:
https://help.github.com/articles/working-with-ssh-key-passphrases/#auto-launching-ssh-agent-on-git-for-windows
==============================================================================================================
# Add to ~/.bashrc (or ~/.profile)

env=~/.ssh/agent.env

agent_load_env () { test -f "$env" && . "$env" >| /dev/null ; }

agent_start () {
    (umask 077; ssh-agent >| "$env")
    . "$env" >| /dev/null ; }

agent_load_env

# agent_run_state: 0=agent running w/ key; 1=agent w/o key; 2= agent not running
agent_run_state=$(ssh-add -l >| /dev/null 2>&1; echo $?)

if [ ! "$SSH_AUTH_SOCK" ] || [ $agent_run_state = 2 ]; then
    agent_start
    ssh-add
elif [ "$SSH_AUTH_SOCK" ] && [ $agent_run_state = 1 ]; then
    ssh-add
fi

unset env

####################################################

Ubuntu Package Updating:
sudo apt-get update
sudo apt-get upgrade

Ubuntu OS Upgrade:
sudo -S apt-mark hold procps strace sudo
sudo -S env RELEASE_UPGRADER_NO_SCREEN=1 do-release-upgrade


Reset User Password:
--------------------
Edit this file in Windows and remove the encrypted entry for password and then save the file:
C:\Users\Jeff\AppData\Local\Packages\CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc\LocalState\rootfs\etc\shadow
Then run "sudo bash" and "passwd <username" to change your password.