ros2foxy cannot import name 'Log' from 'rosgraph_msgs.msg'

This error occurs when the 'Log' message is not available in the 'graph_msgs' package. In ROS 2 Foxy the 'Log' message has been moved to the 'cl_interfaces' package.

To resolve this issue, you need to update your code to import the 'Log' message from the package. Here's an of the updated import statement:

python
from rcl_interfaces.msg import Log
`

Make sure you have 'rcl_interfaces' package in your workspace. You can it using the following command:

sudo apt-get install ros-foxy-rcl-interfaces-msgs

After updating the import statement and ensuring the package is installed, the error should be resolved.