Running Ubuntu core. Both Wifi and Ethernet connections work initially but much later ssh or ping from other hosts on the LAN don't work. I can connect to the web for surfing, updates etc. I can ping hosts on the LAN from the M3 on the Ethernet but the M3 is unreachable from other hosts. M3 --> othe...

Oops! Just remembered 192.168.100.1 is the cable router on my network so that won't work. "nmap -sT 192.168.10.0/24" shows it. Nmap scan report for FriendlyELEC.localdomain (192.168.10.219) Host is up (0.00052s latency). Not shown: 999 closed ports PORT STATE SERVICE 22/tcp open ssh MAC Ad...

I installed s5p6818-ubuntu-core-qte-sd4g-20170420.img, configured usb0 on nano Pi M3 for 192.168.100.1 and tried ssh which is asking for password.
For root I tried "fa", for pi I tried "pi" and for ubuntu I tried "ubuntu", none work.