How to reset the admin password for Ubuntu on Windows

Question

I have Bash Ubuntu on Windows 10. This is enabled by turning on the Developer mode feature so the normal non-programmer would likely not need this. I need to reset the password. I must have typed it wrong (twice, somehow) when I first set it up. How can I do that?

Solution

This has been answered HERE

Copying from their answer:

1. In Windows command prompt change the default user to root:

   lxrun /setdefaultuser root

2. Now Bash on Ubuntu on Windows logs you in as root without asking password

3. Use passwd command in Bash to change the user password:

   passwd your_username

4. Change the default user back to your normal user in Windows command prompt

   lxrun /setdefaultuser your_username