How To Fix '* Failed To Start Daemon Error: Cannot Connect To Daemon' On Linux Ubuntu

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Introduction

Are you experiencing issues with the Android Debug Bridge (ADB) on your Linux Ubuntu system? If you're getting the error '* failed to start daemon error: cannot connect to daemon' when running the command adb devices, don't worry, you're not alone. This error can be frustrating, but it's often a simple fix. In this article, we'll walk you through the steps to resolve this issue and get your ADB up and running smoothly.

Understanding the Error

The error '* failed to start daemon error: cannot connect to daemon' typically occurs when the ADB daemon is not running or is not able to connect to the device. The ADB daemon is a background process that manages the communication between your computer and the Android device. If the daemon is not running or is not able to connect, you'll see this error message.

Prerequisites

Before we dive into the troubleshooting steps, make sure you have the following:

  • A Linux Ubuntu system installed on your computer
  • The ADB tools installed on your system (you can install them using the command sudo apt-get install android-tools-adb android-tools-fastboot)
  • An Android device connected to your computer via USB

Troubleshooting Steps

Step 1: Check the ADB Daemon Status

First, let's check if the ADB daemon is running. You can do this by running the command adb daemon in your terminal. If the daemon is running, you should see a message indicating that it's already running. If not, you can start the daemon by running the command adb start-server.

Step 2: Check the Device Connection

Next, let's check if your Android device is properly connected to your computer. Make sure that the device is connected via USB and that the USB debugging option is enabled on the device. You can check this by going to Settings > Developer options > USB debugging.

Step 3: Check the ADB Version

It's possible that the ADB version on your system is outdated or not compatible with your device. Let's check the ADB version by running the command adb version. If the version is outdated, you can update it by running the command sudo apt-get update && sudo apt-get install android-tools-adb android-tools-fastboot.

Step 4: Restart the ADB Daemon

Sometimes, simply restarting the ADB daemon can resolve the issue. You can do this by running the command adb kill-server followed by adb start-server.

Step 5: Check the Device ID

If none of the above steps resolve the issue, let's check the device ID. You can do this by running the command adb devices. If the device ID is not listed, it may indicate that the device is not properly connected or that the ADB daemon is not able to connect to the device.

Step 6: Check the ADB Log

Finally, let's check the ADB log to see if there are any error messages that may indicate the cause of the issue. You can do this by running the command adb logcat.

Conclusion

The '* failed to start daemon error: cannot connect to daemon' error on Linux Ubuntu can be frustrating, but it's often a simple fix. By following the troubleshooting steps outlined in this article, you should be able to resolve the issue and get your ADB up and running smoothly. Remember to check the ADB daemon status, device connection, ADB version, restart the ADB daemon, check the device ID, and check the ADB log to identify and resolve the issue.

Additional Tips

  • Make sure that the ADB tools are installed on your system and that the device is properly connected via USB.
  • Check the ADB version and update it if necessary.
  • Restart the ADB daemon if it's not running or if it's not able to connect to the device.
  • Check the device ID and make sure that it's listed in the adb devices output.
  • Check the ADB log to see if there are any error messages that may indicate the cause of the issue.

Common Issues and Solutions

  • ADB daemon not running: Run the command adb start-server to start the daemon.
  • Device not connected: Check that the device is properly connected via USB and that the USB debugging option is enabled on the device.
  • ADB version outdated: Update the ADB version by running the command sudo apt-get update && sudo apt-get install android-tools-adb android-tools-fastboot.
  • Device ID not listed: Check that the device is properly connected and that the ADB daemon is able to connect to the device.

Conclusion

Q: What is the ' failed to start daemon error: cannot connect to daemon' error on Linux Ubuntu?*

A: The '* failed to start daemon error: cannot connect to daemon' error on Linux Ubuntu is a common issue that occurs when the Android Debug Bridge (ADB) daemon is not running or is not able to connect to the device.

Q: What are the common causes of this error?

A: The common causes of this error include:

  • The ADB daemon is not running
  • The device is not properly connected via USB
  • The USB debugging option is not enabled on the device
  • The ADB version is outdated
  • The device ID is not listed in the adb devices output

Q: How do I check if the ADB daemon is running?

A: You can check if the ADB daemon is running by running the command adb daemon in your terminal. If the daemon is running, you should see a message indicating that it's already running.

Q: How do I start the ADB daemon?

A: You can start the ADB daemon by running the command adb start-server in your terminal.

Q: How do I check if my device is properly connected via USB?

A: You can check if your device is properly connected via USB by looking for the device in the adb devices output. If the device is not listed, it may indicate that the device is not properly connected.

Q: How do I enable the USB debugging option on my device?

A: You can enable the USB debugging option on your device by going to Settings > Developer options > USB debugging.

Q: How do I update the ADB version on my system?

A: You can update the ADB version on your system by running the command sudo apt-get update && sudo apt-get install android-tools-adb android-tools-fastboot in your terminal.

Q: How do I check the device ID on my device?

A: You can check the device ID on your device by running the command adb devices in your terminal. The device ID should be listed in the output.

Q: What if I'm still experiencing issues after trying the troubleshooting steps?

A: If you're still experiencing issues after trying the troubleshooting steps, it may be worth checking the ADB log to see if there are any error messages that may indicate the cause of the issue. You can do this by running the command adb logcat in your terminal.

Q: Can I use a different ADB version on my system?

A: Yes, you can use a different ADB version on your system. However, you may need to update the ADB version on your system to ensure that it's compatible with your device.

Q: Can I use a different device with my ADB setup?

A: Yes, you can use a different device with your ADB setup. However, you may need to update the ADB version on your system to ensure that it's compatible with the new device.

Q: Can I use a different operating system with my ADB setup?

A: Yes, you can use a different operating system with your ADB setup. However, you may need to update the ADB version on your system to ensure that it's compatible with the new operating system.

Conclusion

In conclusion, the '* failed to start daemon error: cannot connect to daemon' error on Linux Ubuntu can be resolved by following the troubleshooting steps outlined in this article. Remember to check the ADB daemon status, device connection, ADB version, restart the ADB daemon, check the device ID, and check the ADB log to identify and resolve the issue. By following these steps, you should be able to get your ADB up and running smoothly.