Fix "No space left on device" Error in WSL

wsl.exe --shutdown

(Get-ChildItem -Path HKCU:\Software\Microsoft\Windows\CurrentVersion\Lxss | Where-Object { $_.GetValue("DistributionName") -eq '<distribution-name>' }).GetValue("BasePath") + "\ext4.vhdx"

replace <distribution-name> with the actual distribution name.
Example: Ubuntu-20.04

diskpart

Select vdisk file="<pathToVHD>"

replace <pathToVHD> with the actual path to the VHD.
Example: C:\Users\User\AppData\Local\Packages\CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc\LocalState\ext4.vhdx

detail vdisk

expand vdisk maximum=<sizeInMegaBytes>

replace <sizeInMegaBytes> with the actual size in MegaBytes.
Example: 512000

exit