Ethernet and wireless networking disabled Ubuntu 14.04.1 LTS server
Solution 1:
Try these and use manual pages to know about the commands using man command.
sudo nmcli nm enable true
or
sudo service network-manager restart
or
sudo ip link set eth0 up
and
sudo ip link set wlan0 up
Solution 2:
Please be more specific.
The config file to setup your nics is:
/etc/network/interfaces
did you try?
sudo ifup eth0;sudo ifup wlan0
You can also check the status of your nics executing
ip a
You can always check your logs to see what is happening:
cat /var/log/syslog