How to reset Windows WSL user password
The WSL Linux password can be reset easily with below steps:
In Windows once WSL is enabled and any version of Ubuntu installed, there is a ubuntu.exe (or in some cases ubuntu1804.exe, ubuntu1604.exe etc), to configure the Linux subsystem
Step 1: Login to ubuntu as Root
For this change the default user to root
Run this from Windows command prompt or Windows PowerShell
ubuntu.exe config --default-user root
Hint: Press a tab after typing ubuntu, in case your ubuntu.exe name is ubuntu1804.exe it will show that. Use this for all the steps instead of ubuntu.exe
Now Run ubuntu with user as root, the command prompt will start with root@
ubuntu.exe
Step 2: Change User password
See the list of users last added in Ubuntu:
tail /etc/passwd
Change the required user password. Example if user is myusername
passwd myusername
Enter new password and type exit to quit from WSL shell
Now set the default user to your username back
Step 3: Set user back as default user
ubuntu.exe config --default-user myusername
Done. Now you can login to WSL ubuntu with new password