This is a collection of useful information I am acquiring in regards to running Ubuntu Desktop (GUI).

Increase screen timeout to more than 15 minutes (which is the longest that can be chosen from Preferences):

gsettings set org.gnome.desktop.session idle-delay [seconds]

Adjust the amount of time between the screen blanking and the screen locking (defaults to 0 seconds):

gsettings set org.gnome.desktop.screensaver lock-delay [seconds]

Download this keyring file (right click on the link, select 'Save Link As') to the laptop. Install the keyring file with apt, following the example below (which assumes the file is saved in the Downloads directory):

sudo apt install ./Downloads/synaptics-repository-keyring.deb

Update the apt repository:

sudo apt update

Finally, install the DisplayLink driver:

sudo apt install displaylink-driver

Reboot afterwards.

I'm currently on the fence regarding all the different methods of installing packages in Linux. I value security and ease of updating above all other criteria. The methods for each application listed below are the methods I'm currently using for each one; these may be updated on a per application or wholesale basis as my experience evolves.

Install from the Ubuntu Software Store (orange briefcase)

Add the Nextcloud Personal Package Archive (PPA):

sudo add-apt-repository ppa:phoerious/keepassxc

Update the package list:

sudo apt update

Install the Nextcloud Desktop Client:

sudo apt install keepassxc

Add the NextCloud Personal Package Archive (PPA):

sudo add-apt-repository ppa:nextcloud-devs/client

Update the package list:

sudo apt update

Install the Nextcloud Desktop Client:

sudo apt install nextcloud-desktop