1. Introduction

For the new computer, WSL has installed Ubuntu. When entering Ubuntu, an error occurs

WslRegisterDistribution failed with error: 0x800701bc

2. Solution

This is because the wsl2 kernel is not updated

Enter the administrator permission command line, WSL — update

wsl --update
Checking for updates...
Downloading updates...
Installing the update...
This change will take effect the next time WSL is fully rebooted. To force a reboot, run "wsl --shutdown".
Kernel version: 5.10.60.1

Then force restart

wsl --shutdown