- Update example configuration comments
- Refactor server rescue check to use file_exists
- Add Ubuntu installation timeout and polling constants
- Implement non-interactive installation script execution
- Enhance SSH execution with argument parsing
- Add check to skip reinstallation if Ubuntu is already installed
- Copy SSH key to new system during installation
- Poll for installation completion with progress updates
- Use `node.exec` instead of `node.exec_interactive`
- Use `execvp` correctly for shell execution
- Recreate node connection after server reboot
- Adjust SSH wait timeout to milliseconds
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