/etc/network/interfaces --- # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback --- 記述はこれのみ
・やったこと # ip link show dev enp1s0 2: enp1s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 20:89:84:2c:83:70 brd ff:ff:ff:ff:ff:ff # ip link set enp1s0 up # ip link show dev enp1s0 2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 20:89:84:2c:83:70 brd ff:ff:ff:ff:ff:ff （再起動すると DOWN に戻る）
