Upgrade to WSL2 did not work properly

[differentblue]

Environment (after upgrade)

• Microsoft Windows [Version 10.0.19041.329]
• Linux version 4.4.0-19041-Microsoft (Microsoft@Microsoft.com) (gcc version 5.4.0 (GCC) ) Will this be Open Source? #1-Microsoft Fri Dec 06 14:06:00 PST 2019
• lsb_release -r Release: 20.04

Steps to reproduce

I had been running the original WSL for Ubuntu. Following Windows 10 upgrade to 20.04, I used the WSL2 upgrade instructions at https://docs.microsoft.com/en-us/windows/wsl/install-win10#update-to-wsl-2

I downloaded a new Ubuntu 20.04 image from the Windows Store.

There were no errors, but my WSL has not been properly upgraded. I still have the old Linux kernel (4.4.0 as shown above), and I can not run nmap as expected.

Expected behavior

• I expected to be upgraded to Linux kernel 4.19.104-microsoft-standard (this is the version shown in a clean install on another machine)
• I expected to be able to run nmap without error. Instead I get the same errors as WSL1 gives

Troubleshooting

• I have deleted all Linux images (from the Powershell command line) but this did not help
• I unselected WSL from the Turn Windows Feature On or Off dialog to uninstall WSL. I did this, and then rebooted, and then reinstalled. This did not seem to help.
• The openssh version string indicates that some Linux application files are neweven if the kernel has not been (ssh -V says OpenSSH_8.2p1 Ubuntu-4, OpenSSL 1.1.1f 31 Mar 2020)

[therealkenc]

Do a wsl.exe --set-default-version 2 from a non-administrator command prompt. Delete the Ubuntu 20.04 you just installed from the store through the start menu (right-click, uninstall). Then install it again. That might get you there.

[differentblue]

Fantastic! It worked. I assume I had incorrectly done wsl.exe --set-default-version 2 as administrator when I first tried.

Thank you very much!

[LeonardMendicantBias]

Hi, everyone.

I still stuck on 104. I did everything above but the linux kernel still 104. Anything else I can do.
P/s: My computer is inside the university network, could it be the university limit the update?