Apple Thunderbolt to Ethernet adapter problem

Hi community.

I've just recently updated from High Sierra to Mojave and have just noticed that my Apple thunderbolt to Ethernet adapter is no longer working.

System Information shows it's connected, but it doesn't show up in System Preferences / Network. If I try to add a new interface (using the + sign in the bottom left) I am offered Thunderbolt Bridge / Thunderbolt 1 / Thunderbolt 2. Attempting to add any of these fails.

I've swapped out known good ethernet cables and restarted the network switch, but no difference.

The switch shows a connected light when the thunderbolt adapter is plugged in and this goes out when it's pulled.

Console has some interesting things to say, viz:

"/System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/AppleBCM5701Ethernet.kext - dependency 'com.apple.iokit.IOACPIFamily' not found."

"com.apple.iokit.AppleBCM5701Ethernet's dependencies failed security checks; failing."

Can you help?

Best

J

System info:

Thunderbolt to Gigabit Ethernet Adapter:

Vendor Name: Apple Inc.

Device Name: Thunderbolt to Gigabit Ethernet Adapter

Vendor ID: 0x1

Device ID: 0x8003

Device Revision: 0x1

UID: 0x00010002074CC610

Apple Serial Number: DT*******HBS

Route String: 1

Firmware Version: 5.5

Port (Upstream):

Status: Device connected

Link Status: 0x2

Speed: Up to 10Gb/s x1

Port Micro Firmware Version: 0.0.8

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