What is the reason for supporting non-LTS releases of Ubuntu which are only supported for another 2 months after releasing a long-term supported ROS version? I.e. if ROS melodic gets release in May and Ubuntu Artful (17.10) EOL is July, are there actually people using a LTS ROS on a non-LTS Ubuntu during these 2 months?
I actually think that supporting non-LTS Ubuntu versions (build farm resources, forum support) is not very efficient and other long-term Linux distributions or versions could be supported instead (CentOS, …).