Hi, perhaps I wasn't clear, also. I was not just referring to the curl command. What I meant is that when I run the command string:
sudo curl -f -s https://getchannels.com/dvr/setup.sh | sh
from the terminal window of any of those Ubuntu versions I cited, it executes without any errors being displayed and Channels DVR server is installed in my home directory. What I understood from your initial post is that when you ran the command from an Ubuntu terminal window, it did not result in Channels DVR being installed. If I misunderstood, apologies.
-k