zobacz czy system ja widzi, prawdopodobnie interfejs siadł i trzeba go
podniesc
cat /etc/udev/rules.d/70-persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single line.
# PCI device 0x1106:0x3065 (via-rhine)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
ATTR{address}=="00:19:66:37:db:b0", ATTR{type}=="1", KERNEL=="eth*",
NAME="eth0"