Type Ahead search using Nautilus on Ubuntu 18.04 [duplicate]
Solution 1:
Type Ahead search was removed completely from Nautilus, aka GNOME Files, since Artful. Luckily, there is a patch on GitHub that adds this functionality back to Nautilus 3.26.3, the version installed by default in Ubuntu 18.04. Now if you want to apply the patch and build Nautilus from source, go ahead, but there is a guy that did the job for us and provided a PPA to install the patched Nautilus directly:
sudo add-apt-repository ppa:lubomir-brindza/nautilus-typeahead
Then upgrade using sudo apt full-upgrade
and kill Files nautilus -q
Please note that this will overwrite the standard version of Nautilus 3.26 in Ubuntu 18.04 with a third-party build. If you're from the paranoid type you're better off using Nemo or Caja instead.
Source: [1]