Hi MyNameIsCosmo, tnx for your support...some progress but not 100% done yet: - all updates based on "apt-get update" installed - HDMI not working - need to work with cli - uname -a: Linux turtle 4.4.0-1000-joule #0+joule21-Ubuntu SMP PREEMPT Thu Mar 16 14:46:45 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux - following your hint "power saving" -> focussing on Ubuntu not Joule I did the following: sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target -> unix processes will not get stopped/suspended anymore -> seems ok ! -> issue: every 30min the network manager gets a request to "sleep" (syslog) -> wifi connection goes down -> can't restart it automatically (service network-manager restart - nmcli network on - ifup -a) No clue what causes the request for network manager to sleep...given that it is reproducible it seems a "feature". Any idea how to tackle it? Seems I didn't disable all "power saving" options (or what soever causes the nm shutdown...) - can't find anything on the net that fixed it... Every hint/comment welcome... --- [Visit Topic](https://discourse.ros.org/t/turtlebot3-joule-stalled/2739/9) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: