Thanks for bringing this up. it sounds like you are using the ROS dev container templates (which i am also the author of). I’m going to assume you are using the dev container templates, and not the dev_container_ros2 repo from this original post.
I have updated the ros dev container templates today to fix this 
. Try and re-add a dev container configuration to your workspace, and you can expect the jazzy and rolling dev containers generated from the template to get built correctly. I have updated the dockerfile such that the jazzy / rolling templates will re-use the ubuntu user from the base image, instead of creating a new user.
If it works, i appreciate if you could leave a reaction on this post so I know it’s working. If it’s not working, please leave a comment!