Get-AppxPackage -Name "Ubuntu"

Name              : CanonicalGroupLimited.Ubuntu20.04LTS
Publisher         : CN=23596F84-C3EA-4CD8-A7DF-550DCE37BCD0
Architecture      : X64
ResourceId        :
Version           : 2004.6.16.0
PackageFullName   : CanonicalGroupLimited.Ubuntu20.04LTS_2004.6.16.0_x64__79rhkp1fndgsc
InstallLocation   : C:\Program Files\WindowsApps\CanonicalGroupLimited.Ubuntu20.04LTS_2004.6.16.0_x64__79rhkp1fndgsc
IsFramework       : False
PackageFamilyName : CanonicalGroupLimited.Ubuntu20.04LTS_79rhkp1fndgsc
PublisherId       : 79rhkp1fndgsc
IsResourcePackage : False
IsBundle          : False
IsDevelopmentMode : False
NonRemovable      : False
Dependencies      : {CanonicalGroupLimited.Ubuntu20.04LTS_2004.6.16.0_neutral_split.scale-100_79rhkp1fndgsc, CanonicalG
                    roupLimited.Ubuntu20.04LTS_2004.6.16.0_neutral_split.scale-125_79rhkp1fndgsc}
IsPartiallyStaged : False
SignatureKind     : Store
Status            : Ok

vdisk location:

C:\Users\USERNAME\AppData\Local\Packages\CanonicalGroupLimited.Ubuntu20.04LTS_79rhkp1fndgsc\LocalState\ext4.vhdx -Mode full

select vdisk fiel=C:\Users\USERBNAME\AppData\Local\Packages\CanonicalGroupLimited.Ubuntu20.04LTS_79rhkp1fndgsc\LocalState\ext4.vhdx
attach vdisk readonly
compact vdisk
detach vdisk