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For those prefer installing and removing Ubuntu packages via Synaptic package manager, you must have noticed the ‘Quick filter’ search function has been replaced by a search button.

This quick tutorial is going to show you how to re-enable the ‘Quick filter’ function in Synaptic package manager in Ubuntu 18.04, Ubuntu 16.04, and higher.

The search box is offered by ‘apt-xapian-index’, which is a ‘recommends’ dependency package for Synaptic.

1. Open terminal either via Ctrl+Alt+T keyboard shortcut or from application launcher. When it opens, run command to install apt-xapian-index:

sudo apt install apt-xapian-index

Type user password (no asterisks feedback) when it prompts and hit Enter to continue.

2. Then rebuild the search engine index via command:

sudo update-apt-xapian-index -vf

Finally open or re-open Synaptic package manager, and you’ll see the search box back. Unfortunately for perfectionist, the previous ‘Search’ button seems not easy to be removed from tool-bar.