If you what to use a self made "Ubuntu" system on Lyra Pi, as the method as posted in /viewtopic.php?t=2069
, by Crocodile The simple suggestion is to replace the rootfs.img in the Lyra Pi image with the Ubuntu rootfs.img

My test to flash Lyra Pi with mixed images from the one build from Lyra SDK ...

If one want to use docker for Lyra SDK, here is what I did.

Limitation：
Linux system is needed when using SDK in a volume;
No Qt develop environment, yet.

Steps:
1. new folder, edit dockerfile
2. Build docker image
3. Download and extract Lyra SDK
4. run a container with interactive shell
5 ...