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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsClaude Code is supported in WSL, but the fix depends on where it fails: WSL 1 can cause an executable-format error, Windows Node.js paths can break an npm install, and WSL 2 sign-in may need a code pasted back into the terminal. Start by checking your WSL version and matching the error to the steps below.
Check your WSL version first
Anthropic supports Claude Code on Windows and inside WSL. Its setup guide distinguishes WSL 2, which supports sandboxing, from WSL 1, which does not. The current setup and troubleshooting guidance was accessed on October 7, 2026, so check Anthropic’s setup guide for current requirements and labels.
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To check the WSL version, open PowerShell and run wsl -l -v. Find the distribution you use and check the VERSION column. If it is version 1 and Claude Code prints cannot execute binary file: Exec format error, Anthropic documents this as a WSL 1 native-binary issue.
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Preferred fix: convert the distribution to WSL 2
In PowerShell, replace <DistroName> with the distribution name shown by wsl -l -v:
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wsl --set-version <DistroName> 2After conversion, reopen the WSL terminal and try claude again. Conversion changes the WSL environment for that distribution; make sure your work is saved and allow the conversion to finish.
If you must stay on WSL 1
Anthropic documents a dynamic-linker invocation workaround in its troubleshooting guide. It is a workaround for the WSL 1 loader problem, not the preferred repair; use Anthropic’s documented invocation in your ~/.bashrc rather than treating the error as a generic reinstall problem.
Install Claude Code using a WSL-appropriate method
Inside your Linux distribution, Anthropic’s current setup instructions provide this native installer:
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curl -fsSL https://claude.ai/install.sh | bashThen check the installation and run the built-in diagnostic:
claude --version
claude doctorThe native installer is separate from the npm installation route. Anthropic’s setup guide currently requires Node.js 22 or later for the npm package; do not apply that npm prerequisite to the standalone native installer.
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Fix npm or Node errors caused by Windows paths
A WSL shell can accidentally use Windows versions of Node.js or npm through imported Windows PATH entries. That is a toolchain crossover issue, not necessarily a Claude Code defect. In WSL, inspect both executable paths:
which npm
which nodePaths beginning with /mnt/c/ point into the Windows filesystem. For a Linux-based WSL npm install, use Linux Node.js and npm instead, installed through your distribution’s package manager or nvm. If you have nvm installed in both Windows and WSL, Windows PATH entries can cause the Windows installation to take precedence.
If npm reports a platform mismatch
Anthropic’s documented npm-specific workaround is to set npm’s OS configuration to Linux, then install without sudo:
npm config set os linux
npm install -g @anthropic-ai/claude-code --forceIf launch says exec: node: not found
Run which node and which npm in the same WSL terminal where you launch Claude Code. If npm resolves to a Windows path or Node is missing, correct the Linux toolchain and PATH before reinstalling.
When the claude command is missing or the wrong version starts
Anthropic says the native Linux installation places its launcher at ~/.local/bin/claude. Check whether that directory is on PATH, then open a new terminal after changing shell configuration. To locate conflicting launchers and verify what runs, use:
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which -a claude
claude --version
claude doctorIf multiple paths appear, resolve the conflict between the native launcher and any older local npm or global npm installation. Anthropic’s troubleshooting guidance recommends these checks to identify the active command; they are diagnostics, not proof that a particular installation method is at fault.
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WSL 2 and the Windows browser run on different hosts for the callback, so a successful browser sign-in may not automatically return control to the CLI. When Claude Code displays a login code, paste that code into the terminal prompt to finish authentication.
- If no browser opens, set
BROWSERto the Windows browser executable path, or copy the OAuth URL and open it in a browser on the Windows machine. - If pasting at the interactive prompt appears to do nothing, try the terminal’s alternate paste binding or run
claude auth login.
Separate download and network failures from launch failures
If installation cannot fetch a version or download files, test whether the release host is reachable. Anthropic identifies this URL for the check:
https://downloads.claude.ai/claude-code-releases/latest
- An HTTP 200 means the host was reached.
- A 403 can indicate proxy or network filtering, or regional unavailability.
- A 5xx response commonly indicates a temporary service issue.
- No output, DNS errors, or timeouts point to a connectivity problem.
On a corporate network, check proxy and TLS configuration. Anthropic documents HTTP_PROXY and HTTPS_PROXY for proxy settings and NODE_EXTRA_CA_CERTS for a custom certificate authority. Do not disable TLS verification as a general workaround. See Anthropic’s troubleshooting guidance for the relevant configuration details.
Choose the environment that fits your workflow
| Environment | What to know |
|---|---|
| WSL 2 | Linux environment; Anthropic’s setup guide says sandboxing is supported. |
| WSL 1 | Sandboxing is not supported; Anthropic documents a native-binary failure and recommends conversion to WSL 2 when possible. |
| Native Windows | A Windows-native option covered by Anthropic’s setup guide. |
If your project and command-line tools already live in Linux, keep Claude Code and its toolchain in WSL rather than mixing Windows and Linux Node/npm paths. If you prefer a Windows-native shell, follow the native Windows setup route instead. Anthropic’s current instructions distinguish these supported environments in the setup guide.
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