XPS 13 9380 + TB16 Dock + Ubuntu: No external keyboard

Brand new 2019 model 9380 + Thunderbolt TB16 dock.  TB dock is registered to system via settings.  I have a Dell 23" touchscreen as a second monitor, a wired internet connection, a Dell USB and a Dell USB mouse connected to the dock.

When I made initial TB connection everything worked.  Rebooted machine after an apt update, and now only screen and wired ethernet work.  No external keyboard or mouse.

Output of lspci:

00:00.0 Host bridge: Intel Corporation Device 3e34 (rev 0b)
00:02.0 VGA compatible controller: Intel Corporation Device 3ea0
00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 0b)
00:08.0 System peripheral: Intel Corporation Skylake Gaussian Mixture Model
00:12.0 Signal processing controller: Intel Corporation Device 9df9 (rev 30)
00:14.0 USB controller: Intel Corporation Device 9ded (rev 30)
00:14.2 RAM memory: Intel Corporation Device 9def (rev 30)
00:15.0 Serial bus controller [0c80]: Intel Corporation Device 9de8 (rev 30)
00:15.1 Serial bus controller [0c80]: Intel Corporation Device 9de9 (rev 30)
00:16.0 Communication controller: Intel Corporation Device 9de0 (rev 30)
00:1c.0 PCI bridge: Intel Corporation Device 9dbc (rev f0)
00:1c.6 PCI bridge: Intel Corporation Device 9dbe (rev f0)
00:1d.0 PCI bridge: Intel Corporation Device 9db0 (rev f0)
00:1d.4 PCI bridge: Intel Corporation Device 9db4 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Device 9d84 (rev 30)
00:1f.3 Audio device: Intel Corporation Device 9dc8 (rev 30)
00:1f.4 SMBus: Intel Corporation Device 9da3 (rev 30)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Device 9da4 (rev 30)
01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)
02:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter (rev 32)
03:00.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
04:00.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
04:01.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
04:02.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
04:04.0 PCI bridge: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] (rev 02)
05:00.0 System peripheral: Intel Corporation JHL6540 Thunderbolt 3 NHI (C step) [Alpine Ridge 4C 2016] (rev 02)
39:00.0 USB controller: Intel Corporation JHL6540 Thunderbolt 3 USB Controller (C step) [Alpine Ridge 4C 2016] (rev 02)
3a:00.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3b:01.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3b:04.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3d:00.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3e:01.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3e:04.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3f:00.0 USB controller: ASMedia Technology Inc. ASM1042A USB 3.0 Host Controller
6e:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd Device a808

 Output of lsusb:

Bus 006 Device 004: ID 0bda:8153 Realtek Semiconductor Corp. 
Bus 006 Device 003: ID 0424:5534 Standard Microsystems Corp. Hub
Bus 006 Device 002: ID 0424:5807 Standard Microsystems Corp. 
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 008: ID 413c:3016 Dell Computer Corp. Optical 5-Button Wheel Mouse
Bus 005 Device 006: ID 413c:2005 Dell Computer Corp. RT7D50 Keyboard
Bus 005 Device 004: ID 0bda:4014 Realtek Semiconductor Corp. 
Bus 005 Device 009: ID 2149:2316 Advanced Silicon S.A. 
Bus 005 Device 005: ID 0424:2412 Standard Microsystems Corp. 
Bus 005 Device 003: ID 0424:2134 Standard Microsystems Corp. Hub
Bus 005 Device 002: ID 0424:2807 Standard Microsystems Corp. 
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0489:e0a2 Foxconn / Hon Hai 
Bus 001 Device 002: ID 0c45:6723 Microdia 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

So it would seem that system sees the keyboard and mouse.

Linux 4.15.0-1030-oem #35-Ubuntu
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.1 LTS
Release:	18.04
Codename:	bionic

Despite several warnings on all the packaging that BIOS and driver need updating before connection the TB16, there are no driver, bios or other updates for Ubuntu on Dell support website, Something I have confirmed with Dell themselves.

Anyone have an idea of what will make this work?  Without the dock, system is a very expensive brick! (and will likely go back under 30 day guarantee, which is a shame as it is otherwise a lovely machine.)

Thanks