WSL2 Upgrade Debian 10 to Debian 11 "bullseye" [Easy way]

When I Installed WSL by default it installed Debian 10 which was the latest version available that time.

Not latest version of Debian bullseye released. 

Method 1: Fails

Try to execute

sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade
 

sudo apt update -y && sudo apt full-upgrade -y

Method 2: Working Method confirmed in 2022

Open sources.list file and change every buster to bullseye 

sudo vim /etc/apt/sources.list

to 

This above version is the modified sources.list to update the debian to bullseye Debian 11 version.

Then execute following command:

sudo apt full-upgrade
 

Everything Upgraded.

Make sure to run 

sudo apt update -y && sudo apt upgrade -y
 

Then Close and reopen the Terminal/Powershell/Bash window

Check your debian version now

Thats it.