WSL2 fails to mount C:\Program Files\WSL\system.vhd with HCS/ERROR_NOT_FOUND when converting distro to version 2

Windows Version

Windows 11 23H2 OS Build 22631.4169

WSL Version

2.6.3.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version

6.6.87.2-1

Distro Version

Ubuntu 24.04.4

Other Software

No response

Repro Steps

1. wsl --set-default-version 1
2. wsl --install -d Ubuntu
3. Ubuntu installs successfully as WSL1
4. Run wsl --set-version Ubuntu 2

Expected Behavior

Ubuntu should convert from WSL1 to WSL2 successfully.

Actual Behavior

Conversion fails with:

无法将磁盘“C:\Program Files\WSL\system.vhd”附加到 WSL2: 找不到元素。
错误代码: Wsl/Service/CreateVm/MountDisk/HCS/ERROR_NOT_FOUND

Additional Notes

• wsl --version works normally
• wsl --install -d Ubuntu fails under WSL2 path, but succeeds under WSL1
• Microsoft-Windows-Subsystem-Linux is Enabled
• VirtualMachinePlatform is Enabled
• DISM /Online /Cleanup-Image /RestoreHealth completed successfully
• sfc /scannow found no integrity violations
• C:\Program Files\WSL\system.vhd exists
• net start vds was tried, but the issue remained

Diagnostic Logs

I collected logs with collect-wsl-logs.ps1.

WslLogs-2026-03-20_21-00-35.zip

Start by reproducing the documented commands, especially wsl --set-version Ubuntu 2, and review the collected WslLogs-2026-03-20_21-00-35.zip alongside the reported system.vhd path and HCS error. Done means Ubuntu converts from WSL1 to WSL2 successfully without the mount failure.