Some experiments,
1. Try the driver mentioned in #9. The bug still exists.

2. Blacklisted alx and inserting the module after the booting, the
system is still failed to connect to wired network.

3. echo 1 > /sys/class/net/eth0/device/reset , the system can connect to
wired network.

Since both re-enable network  and re-insert module involved NIC reset (power 
down then power up), 
I suspect this it may be a hardware bug.

** Changed in: linux (Ubuntu)
       Status: In Progress => Triaged

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https://bugs.launchpad.net/bugs/1223647

Title:
  [AR8161][1969:1091][wired connection failed] wired connection could
  not be established until re-insert alx kernel module or re-enable
  "networking" via network manager indicator

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