Windows 10 Linux Subsystem How to Change User Name and PC Name for Bash Console

According to therobyouknow's comment, LxRun.exe is deprecated now.

Please refer to Mitchell Van Manen's answer if you're using the new version of subsystem.

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You should use LxRun.exe command locating in C:\WINDOWS\system32.

Here are two solutions, which are all run in cmd.exe instead of bash.

• Use the command below to create a new user and set it as the default user:

  LxRun.exe /setdefaultuser NEW_USER
  

• OR Uninstall Linux subsystem fully and reinstall it

  LxRun.exe /uninstall /full
  LxRun.exe /install
  

  The next time you reenter bash, it will prompt you to input username.

In the new version of the subsystem, the command is (from elevated cmd.exe):

C:\> ubuntu run sudo usermod -l newUsername oldUsername

this way you will circumvent logging in with the old username first.