It’s not reasonable for ubuntu(subsystem) not release space after deleting file. How to solve this problem?

First, search vdisk file path on C:\Users\Myname\AppData\Local\Packages, mine is:

C:\Users\Myname\AppData\Local\Packages\CanonicalGroupLimited.Ubuntu20.04LTS_79rhkp1fndgsc\LocalState\ext4.vhdx

Then, under Windows PowerShell, execute:

wsl --shutdown
diskpart

And then execute follows to compat vdisk and release deleted file.

select vdisk file='C:\Users\Myname\AppData\Local\Packages\CanonicalGroupLimited.Ubuntu20.04LTS_79rhkp1fndgsc\LocalState\ext4.vhdx'
attach vdisk readonly
compact vdisk
detach vdisk
exit

Last, check disk space.

reference link:https://blog.csdn.net/qq_39970131/article/details/119636442