WSL 2 fails with 0xc03a0014 while installing Ubuntu

[AkiraNyx]

Windows Version

Microsoft Windows [Version 10.0.26300.8170]

WSL Version

2.6.3.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version

N/A - Cannot install, fails before distro is registered

Distro Version

N/A - Cannot install, fails before distro is registered

Other Software

None

Repro Steps

1. Run: wsl --install -d Ubuntu
2. WSL downloads Ubuntu successfully
3. Installation fails at registration step
4. Error: Wsl/InstallDistro/Service/RegisterDistro/0xc03a0014

Expected Behavior

Ubuntu should install and register successfully under WSL 2.

Actual Behavior

Installation fails with error:
"找不到指定文件的虚拟磁盘支持提供程序"
Error code: Wsl/InstallDistro/Service/RegisterDistro/0xc03a0014

Troubleshooting steps already taken:

• VirtualMachinePlatform: Enabled
• Microsoft-Windows-Subsystem-Linux: Enabled
• HypervisorPlatform: Enabled
• Microsoft-Hyper-V-All: Enabled (vmms service Running)
• vhdmp.sys driver: manually started, STATE: 4 RUNNING
• wsl --update: already on latest version
• VirtualizationFirmwareEnabled returns False via WMI (BIOS VT-x is actually enabled)
• Issue persists after all above steps. Suspected regression in Build 26300.

Diagnostic Logs

N/A - wsl --status output is garbled due to encoding issue.
Screenshots attached showing all troubleshooting steps.

[github-actions]

Logs are required for review from WSL team

If this a feature request, please reply with '/feature'. If this is a question, reply with '/question'.
Otherwise, please attach logs by following the instructions below, your issue will not be reviewed unless they are added. These logs will help us understand what is going on in your machine.

How to collect WSL logs

Download and execute collect-wsl-logs.ps1 in an administrative powershell prompt:

Invoke-WebRequest -UseBasicParsing "https://raw.githubusercontent.com/microsoft/WSL/master/diagnostics/collect-wsl-logs.ps1" -OutFile collect-wsl-logs.ps1
Set-ExecutionPolicy Bypass -Scope Process -Force
.\collect-wsl-logs.ps1

The script will output the path of the log file once done.

If this is a networking issue, please use .\collect-wsl-logs.ps1 -LogProfile networking instead, following the instructions in Collect WSL logs for networking issues

Once completed please upload the output files to this GitHub issue.

See Collect WSL logs (recommended method).

If you choose to email these logs instead of attaching them to the bug, please send them to wsl-gh-logs@microsoft.com with the GitHub issue number in the subject, and include a link to your GitHub issue comment in the message body, and reply with '/emailed-logs'.

[AkiraNyx]

WslLogs-2026-04-13_06-55-59.zip

[github-actions]

Diagnostic information

Detected appx version: 2.6.3.0
Detected user visible error: Wsl/InstallDistro/Service/RegisterDistro/0xc03a0014