First on Windows

Install XMing (or VcXsrc).

Turn off Windows Defender Firewall under Public network settings.

Start XMing from Windows PowerShell.

& 'C:\Program Files (x86)\Xming\Xming.exe' -multiwindow -clipboard -ac

The most important option is -ac because it disables access control. The other two options are optional.

Aside: This is how to stop XMing from Windows PowerShell.

Get-Process -Name XMing | Stop-Process

Then on Linux via WSL 2

Install test GUI applications.

sudo apt-get install x11-apps

Set the DISPLAY variable.

export DISPLAY=$(cat /etc/resolv.conf | grep nameserver | awk '{print $2; exit;}'):0

Run one of the test GUI applications.

xeyes

If that works, install and launch a non-test application (e.g. Firefox).

sudo apt-get install firefox
firefox

Cypress Specific

Start D-Bus

sudo /etc/init.d/dbus start &> /dev/null

Then start Cypress from WSL as you would from Linux normally.

If you see the following warnings or errors, it is okay to ignore them. Find the X-Server windows and maximize it. Cypress is probably working.

[2489:0630/153138.508735:ERROR:bus.cc(393)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix")