Ubuntu – Can the shopping lens be changed to display results from Amazon.co.uk

Ubuntu 17.10 (and then 18.04) has brought a few changes (for prior versions, see one of the other answers). There are no longer any Amazon/web search results when you search in the Dash, but the Amazon icon remains in the launcher by default. It is part of the ubuntu-web-launchers package, which can be removed with:

sudo apt-get remove ubuntu-web-launchers

At the time of this writing, Amazon appears to be the only thing in the package, so it should be fine to remove. Keep in mind that this might not be the case in the future, so it might be safer to just remove Amazon if you might want to keep other web launchers. Take a look at the list of files in the package and get rid of the Amazon ones:

sudo rm /usr/share/applications/com.canonical.launcher.amazon.desktop
sudo rm /usr/share/applications/ubuntu-amazon-default.desktop

Mark Tully has created a shopping lens independent of Canonical's unity-lens-shopping.

Search results in the independent lens are still Canonical/Amazon affiliated links and purchases made will help fund Ubuntu. To install the independent shopping lens simply run the following two commands in the terminal (Ctrl+Alt+T).

sudo add-apt-repository ppa:markjtully/ppa
sudo apt-get update && sudo apt-get install unity-lens-shopping-alternate 

Remove shopping results from the home lens with the terminal command below. This will uninstall Canonical's default shopping lens.

sudo apt-get remove unity-lens-shopping

Found on omgubuntu