How to upgrade Ubuntu 20.04 lts to Ubuntu22 04 lts on windows 10 or 11 in wsl2

First thing is to ensure that vm / hypervisor / subsystem for Linux windows are installed on your system! After rebooting your system you then upgrade wsl to wsl2 via command prompt in windows.

Open PowerShell as Administrator.

To install WSL, run this command:

dism.exe /online /enable-feature /featurename:Microsoft-Windows-Subsystem-Linux /all /norestart

Enable the Virtual Machine Platform optional feature by running the following command: 

dism.exe /online /enable-feature /featurename:VirtualMachinePlatform /all /norestart

Restart Windows 

Download the latest Linux kernel update package and install it: WSL2 Linux kernel update package for x64 machines

https://wslstorestorage.blob.core.windows.net/wslblob/wsl_update_x64.msi

Set WSL 2 as your default version. Open  PowerShell as Administrator and run: 

wsl --set-default-version 2

You can now install WSL 2 distros from the Microsoft Store.

Reboot windows

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1) Download, and install Ubuntu 20.04 from the windows store for free.

2) Do a distro upgrade to a current supported Linux version

sudo apt update

sudo apt list --upgradable

sudo apt upgrade

(REBOOT WINDOWS)

then restart Ubuntu console and type

sudo apt update

sudo apt install update-manager-core

sudo nano /etc/update-manager/release-upgrades

change lts to normal in this file then ctrl x y and then press enter to save and exit.

sudo do-release-upgrade

Incase of error status 1 do

sudo apt remove snapd

sudo apt update

sudo do-release-upgrade

when it asks you to remove packages type n and hit enter then y to reboot! you can remove them later!

reboot windows

3) Do another distro upgrade to 22.04 lts

sudo apt update

sudo apt upgrade

sudo apt dist-upgrade

sudo do-release-upgrade -d

4) Install a desktop environment (kubuntu desktop)

sudo apt-get install kubuntu-desktop

choose lightdm as your desktop manager when prompted for it!

sudo update-alternatives --config x-session-manager

change the session to Kubuntu desktop not the default gnome

sudo apt-get install xrdp

sudo /etc/init.d/xrdp start

sudo cp /etc/xrdp/xrdp.ini /etc/xrdp/xrdp.ini.bak

 you can use any port you want starting with 33

use this command to edit the file

sudo sed -i 's/3389/3390/g' /etc/xrdp/xrdp.ini

 Or use this command to edit it manually

sudo nano /etc/xrdp/xrdp.ini

Then the following

sudo sed -i 's/max_bpp=32/#max_bpp=32\nmax_bpp=128/g' /etc/xrdp/xrdp.ini

sudo sed -i 's/xserverbpp=24/#xserverbpp=24\nxserverbpp=128/g' /etc/xrdp/xrdp.ini

sudo /etc/init.d/xrdp restart

6) Enable dbus if its not already enabled

sudo systemctl enable dbus

sudo /etc/init.d/dbus start

7) Log into the new desktop via remote desktop app on windows

type localhost:(the port you used goes here) into remote desktop address.

localhost:3390 for example

then login with your Linux user name, and password

It should work now! 

next time you login to the Linux console you will have to start services before remote login,

sudo /etc/init.d/dbus start

sudo /etc/init.d/xrdp start