Turning off secure boot
Turning off secure boot in the BIOS solved the problem. I will probably try signing the driver later.
The first time the system came up after secure boot was turned off, I got the following error when I tried to configure the display settings.
Cannot open “Display” settings, error “Could not get screen information”
Doing the following --
sudo apt-get install --reinstall ubuntu-desktop
-- and then rebooting solved that problem.
Below is the output from lsusb. I believe I saw two DisplayLink drivers when I used the old driver with Ubuntu 15.10.
algotrader@algotrader-XPS-13-9350:~$ lsusb
Bus 002 Device 003: ID 17e9:436c DisplayLink
Bus 002 Device 002: ID 05e3:0612 Genesys Logic, Inc.
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 009: ID 0bda:5682 Realtek Semiconductor Corp.
Bus 001 Device 007: ID 04f3:20d0 Elan Microelectronics Corp.
Bus 001 Device 005: ID 8087:0a2b Intel Corp.
Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 010: ID 0781:5530 SanDisk Corp. Cruzer
Bus 001 Device 011: ID 046d:0a29 Logitech, Inc. H600 [Wireless Headset]
Bus 001 Device 006: ID 046d:0a29 Logitech, Inc. H600 [Wireless Headset]
Bus 001 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 002: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
algotrader@algotrader-XPS-13-9350:~$
The sound settings are somewhat confused, but I doubt that problem has any connection with the display link driver.
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