Public bug reported:

Latest kernel linux-image-4.15.0-76 is not able to recognise the
external displays from the docking station

$ lsb_release -rd
Description:    Ubuntu 18.04.4 LTS
Release:        18.04


$ apt-cache policy linux-image-4.15.0-76-generic
linux-image-4.15.0-76-generic:
  Installed: 4.15.0-76.86
  Candidate: 4.15.0-76.86
  Version table:
 *** 4.15.0-76.86 500
        500 http://ca.archive.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
        500 http://ca.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
        100 /var/lib/dpkg/status


bzanaj@hostname:~$ sudo apt list | grep linux-image | grep installed


WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

linux-image-4.15.0-64-generic/bionic-security,bionic-updates,now 4.15.0-64.73 
amd64 [installed,automatic]
linux-image-4.15.0-74-generic/bionic-security,bionic-updates,now 4.15.0-74.84 
amd64 [installed,automatic]
linux-image-4.15.0-76-generic/bionic-security,bionic-updates,now 4.15.0-76.86 
amd64 [installed,automatic]
linux-image-generic/bionic-security,bionic-updates,now 4.15.0.76.78 amd64 
[installed]

** Affects: linux-signed-hwe (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1862653

Title:
  Ubuntu does not recognize external monitors when attached through
  docking station

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