Whats the error when you run the whonix check?
user@host:~$ whonixcheck
[INFO] [whonixcheck] multinodo-nikki | Whonix-Workstation | whonix-ws-14 TemplateBased AppVM | Thu Nov 15 03:17:05 UTC 2018
eth0: error fetching interface information: Device not found
[ERROR] [whonixcheck] check network interfaces Result: network interface eth0 not up!
If you know what you are doing, feel free to disable this check.
Create a file /etc/whonix.d/50_whonixcheck_user.conf and add:
whonixcheck_skip_functions+=" check_network_interfaces "
Debugging information:
Command sudo --non-interactive /sbin/ifconfig eth0 failed.