Hey all,
Im trying to run 15 (yes 15) instances of klipper on a single server for the 3D printing lab at school. I have a 16 core Xeon and 64gb of ram and all is going pretty good except one thing. Security policy requires me to use full Ubuntu or Ubuntu server. And I’m getting mcu connection errors (mcu just will not connect) if the user isn’t logged in. Any way around this that you know of?
Well, I’m running my Octoprint instance on a full Ubuntu server as well (albeit only a single instance) and I never experienced such a behaviour.
Did you add the user running klipper to the dialout group?
usermod -a -G dialout your_klipper_user(s)
A more brutal solution could also be to add a udev rule /etc/udev/rules.d/:
KERNEL=="ttyACM[0-9]*",MODE="0666"
assuming you connect via USB, otherwise replace by a suitable identification string.
I’ll try that on Friday! Also wish me luck this week I have 92 prints in the queue 
It did work! I just assumed kiauh or the install scripts would do that but I guess not