run command lxrun failed

I use the command(cmd) "lxrun /uninstall /full /y" to uninstall my sublinux in my Windows 10.Then,I use the cmd "lxrun /install /y" to reinstall,but there is problem I encountered as flows:

- Beta features - This will install Ubuntu distributed by Canonical on Windows Under the terms of its license, see this link: https://aka.ms/uowterms Downloading from the Windows app store ... Error: 0x80072f7d Downloading from the Windows app store ... Error: 0x80072f7d Downloading from the Windows app store ... Error: 0x80072f7d Can not be downloaded from the Windows app store. Please check the network connection.

I ensure that other applications include Windows App Stor can access the Internet,becase I tried and successed just now. so,I have no idea and has anyone ever encountered this problem?