"Install WSL on Windows hosts when proxy tests are enabled.." fails intermittently with repeated "adduser: Only one or two names allowed." until operation canceled

[ahsonkhan]

From unrelated PR:
#4393

On Win2022_Win32Api_debug_tests_x64
https://dev.azure.com/azure-sdk/public/_build/results?buildId=2597158&view=logs&j=62f96420-69e0-55c5-87e4-47c3c06a1c78&t=569ea126-27b5-5a23-71c4-ce1c427a6ea6&l=13328

2023-03-01T01:46:00.5056187Z ##[section]Starting: Install WSL on Windows hosts when proxy tests are enabled..
2023-03-01T01:46:00.5190074Z ==============================================================================
2023-03-01T01:46:00.5190676Z Task         : PowerShell
2023-03-01T01:46:00.5190895Z Description  : Run a PowerShell script on Linux, macOS, or Windows
2023-03-01T01:46:00.5191234Z Version      : 2.212.0
2023-03-01T01:46:00.5191458Z Author       : Microsoft Corporation
2023-03-01T01:46:00.5191742Z Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/utility/powershell
2023-03-01T01:46:00.5192099Z ==============================================================================
2023-03-01T01:46:01.5860267Z Generating script.
2023-03-01T01:46:01.6316297Z ========================== Starting Command Output ===========================
2023-03-01T01:46:01.6574046Z ##[command]"C:\Program Files\PowerShell\7\pwsh.exe" -NoLogo -NoProfile -NonInteractive -ExecutionPolicy Unrestricted -Command ". 'D:\a\_temp\a469cf37-7939-4632-8131-96dc791c0e2c.ps1'"
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2023-03-01T01:46:34.9620774Z �
2023-03-01T01:47:33.7992460Z adduser: Only one or two names allowed.
2023-03-01T01:47:34.0451960Z adduser: Only one or two names allowed.
2023-03-01T01:47:34.3090514Z adduser: Only one or two names allowed.
...
2023-03-01T01:48:06.4226063Z adduser: Only one or two names allowed.
2023-03-01T01:48:06.6416411Z adduser: Only one or two names allowed.
2023-03-01T01:48:06.8603802Z adduser: Only one or two names allowed.
2023-03-01T01:48:07.0679236Z adduser: Only one or two names allowed.
2023-03-01T01:48:07.2763055Z adduser: Only one or two names allowed.
2023-03-01T01:48:07.2882469Z �Installing, this may take a few minutes...
2023-03-01T01:48:07.2892989Z 
2023-03-01T01:48:07.2900654Z Please create a default UNIX user account. The username does not need to match your Windows username.
2023-03-01T01:48:07.2912470Z 
2023-03-01T01:48:07.2916766Z For more information visit: https://aka.ms/wslusers
2023-03-01T01:48:07.2927510Z 
2023-03-01T01:48:07.4889111Z adduser: Only one or two names allowed.
2023-03-01T01:48:07.7009238Z adduser: Only one or two names allowed.
2023-03-01T01:48:07.9142542Z adduser: Only one or two names allowed.
...
2023-03-01T02:34:58.9657845Z adduser: Only one or two names allowed.
2023-03-01T02:34:59.1753474Z adduser: Only one or two names allowed.
2023-03-01T02:34:59.3827180Z adduser: Only one or two names allowed.
2023-03-01T02:34:59.5920161Z adduser: Only one or two names allowed.
2023-03-01T02:34:59.8015666Z adduser: Only one or two names allowed.
2023-03-01T02:35:00.0206205Z adduser: Only one or two names allowed.
2023-03-01T02:35:00.2476662Z adduser: Only one or two names allowed.
2023-03-01T02:35:00.4678607Z adduser: Only one or two names allowed.
2023-03-01T02:35:00.6803694Z adduser: Only one or two names allowed.
2023-03-01T02:35:00.8921961Z adduser: Only one or two names allowed.
2023-03-01T02:35:01.6092409Z Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username:
...
UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: Enter new UNIX username: E
2023-03-01T02:35:01.8506526Z ##[error]The operation was canceled.
2023-03-01T02:35:01.8606824Z ##[section]Finishing: Install WSL on Windows hosts when proxy tests are enabled..

cc @danieljurek

[ahsonkhan]

A re-run didn't succeed.

[jeromelaban]

I'm getting this issue as well in another repo that uses WSL in Azure DevOps hosted agents, it used to work properly about a month ago. Did you find anything that could work around it? Thanks!

[joshmouch]

It may be completely unrelated, but I got this "adduser:..." error when I did an "Enter-PSSession" to a server to install a disto instead of "ssh" to the server. The difference may have been that the first used an Active Directory admin and the later used a local machine admin account.