Connect 3 monitor using Dell-D6000 dock with Ubuntu

1.) Quick Command List:

For Quick reference below are the commands that worked for me (troubleshooting links are mentioned below )

sudo apt-get install dkms
sudo apt install evdi-dkms
sudo apt install ./Downloads/synaptics-repository-keyring.deb #download from www.synaptics.com [Link mentioned below]
sudo apt update
sudo apt install displaylink-driver

2.) Prerequisites:

Specification
1.) Ubuntu version [lsb_release -a]: Ubuntu 22.04.4 LTS 
2.) Kernel version [uname -r]: 6.5.0-35-generic

A.) Install DKMS (Dynamic Kernel Module Support) & EVDI (Extensible Virtual Display Interface).

sudo apt-get install dkms
sudo apt install evdi-dkms

About DKMS & EVDI

B.) Install DisplayLink Driver: Steps mentioned here

Download Synaptics

sudo apt install ./Downloads/synaptics-repository-keyring.deb 
sudo apt update
sudo apt install displaylink-driver

PS: if you are installing via a standalone installer then one might have to make it executable i.e

chmod +x displaylink-driver-6.0.0-24.run
sudo ./displaylink-driver-6.0.0-24.run

After the above process, it will ask to set the MOK (Machine Owner Key)  password & reboot.
More about MOK.

Tadda !!!

Troubleshoot Reference :
https://askubuntu.com/questions/1487364/installing-displaylink-driver-on-ubuntu-20-04-unmet-dependency-evdi
https://askubuntu.com/questions/1480479/cant-install-synaptics-displaylink-driver-on-ubuntu-22-04

After the Upgrade, it stopped working so uninstalled-installed the package https://ubuntuforums.org/archive/index.php/t-2468435.html

sudo displaylink-installer uninstall