In Ubuntu 16 if you held down the super key, the applications in the dock display with a number. If you continue holding the super key and then hit one of those numbers, the application launches.
Is there a shortcut like this for Ubuntu 18?
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Simply press and hold Super+Q. You should see numbers appearing next to the application icons. Then release Q and press the number associated to your target application to launch it.
You can alternatively press Super+number directly to launch the application without pressing Super+Q first.
If pressing Super+Q fails to show the numbers, run the following command first.
gsettings set org.gnome.shell.extensions.dash-to-dock hot-keys false
A dock for the Gnome Shell. This extension moves the dash out of the overview transforming it in a dock for an easier launching of applications and a faster switching between windows and desktops. Side and bottom placement options are available.
Extension Homepage https://micheleg.github.io/dash-to-dock/
sudo apt install gnome-tweaks
Configure keyboard shortcuts:
Open the configuration, open gnome-tweaks, click on the left tab Extension and search the Dash to Dock. Click on Configure Icon and go to the tab and enable as shown below.
Dash to Dock GNOME extension, and modify the settings to do this...
I am using Ubuntu 18.04 and
Dash to dock, but it didn't work even the extension was configured like in @abu_bua's answer.
I used this two methods to fix it
Go to extension settings and switch the setting off and on again.
Another, simper and faster way was to run
gsettings set org.gnome.shell.extensions.dash-to-dock hot-keys true
After some time I realized that this solution #2 above doesn't always work, but luckily the
Dash to dock had no advatage for me, so you can turn it off and the shortcuts will start working. Luckily it seems that you can configure the native dock with it.