It depends if you want to use cloud functionality.
The easier way is without cloud, you will not be able to flash CORE2 through web IDE, but all other featuers will remain usable, you will be able to:
- flash COER2 using VSC plugin
- use Remote Desktop
- use ROS
- use webUI
To use without cloud, you can follow CORE2-ROS local serial offline tutorial
If you want to use cloud functionality, we will need to prepare cloud client for Ubuntu 18.04. Currently we do not provide it ready made, as we do not support Ubuntu 18.04 yet (but we are planning to do it in future).
Preparing the cloud client may take some time (for building and testing).