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ifconfig -a
may include something like this
eth0: flags=4098<BROADCAST,MULTICAST> mtu 1500
ether b8:27:eb:2c:94:19 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
If these conditions obtain:
then it's likely that the boot disk doesn't contain the requisite firmware. So upgrade NOOBS.
sudo mkdir -p /media/pi/MMC_P1
sudo mount -t vfat /dev/mmcblk0p1 /media/pi/MMC_P1
sudo find /media/pi/MMC_P1 -mindepth 1 -delete
sudo unzip /home/pi/NOOBS_v2_7_0.zip -d /media/pi/MMC_P1
With runinstaller removed, the line should look like this
quiet ramdisk_size=32768 root=/dev/ram0 init=/init vt.cur_default=1 elevator=deadline