I installed 18.1 Cinn. the other day and had this issue from the beginning.
When the system is powered on from shutdown, restart, sleep, etc. -- the wired network cable remains "unplugged/disconnected".
This can be fixed by physically unplugging the cable and holding it in again (until the lights flash). The connection is then established; however this is tiresome.
I tried this solution viewtopic.php?t=91152 (to edit /etc/rc.local), however it did not fix the issue.
This is the ethernet controller:
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00:19.0 Ethernet controller: Intel Corporation 82562V-2 10/100 Network Connection (rev 02)
Subsystem: Dell Inspiron 530
Flags: bus master, fast devsel, latency 0, IRQ 25
Memory at fdfc0000 (32-bit, non-prefetchable) [size=128K]
Memory at fdfff000 (32-bit, non-prefetchable) [size=4K]
I/O ports at fe00 [size=32]
Capabilities: <access denied>
Kernel driver in use: e1000e
Kernel modules: e1000e