Whenever I try to use AWS Boto3 send_command() on Ubuntu, it always fails and shows an error message stating "InvalidInstanceId" when I call the SendCommand operation.

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There could be several reasons why you are receiving the "InvalidInstanceId" error message when using the send_command() function in AWS Boto3. Some of the common causes are:

1. Instance ID is incorrect – You may have provided an incorrect instance ID, which is causing the error. Double-check the instance ID you are passing to the function.

2. Instance is not running – The instance you are trying to execute the command on may not be running. Verify that the instance is in the running state before sending the command.

3. The SSM agent is not installed – The SSM agent needs to be installed and running on the instance for send_command() to work. Make sure the SSM agent is installed by checking the instance's system log.

4. Instance role permissions – The instance role associated with the instance may not have the necessary permissions to execute the command. Ensure that the instance role has the required permissions for the command you are trying to execute.

5. Incorrect region – Make sure that you are executing the command within the correct AWS region. The region can be specified as an argument in the send_command() function.

If you have verified the above causes and still cannot resolve the issue, you can try to enable debug logging to get more information about the issue. This can help you troubleshoot and identify the root cause of the error.