Why do I have two docks in Ubuntu desktop (with GNOME 3) after installing Dash to Dock?

Open the Extensions app in your App Gallery and disbale all the docks that you don't want to use.

In my case I had to disable the Ubuntu Dock because I was using Floating Dock

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@leoperbo, maybe we don't need to remove and login/logout.

This simply worked for me.

1. Install Dash to Dock.
2. Make all your customization.
3. Disable Dash to Dock from Tweaks>Extensions
4. If you want to re-customize enable dash-to-dock, change preferences and disable it back.

The following is working for me:

1. Install and configure the "dash to dock" extension

2. Edit the following file:

   sudo vi /usr/share/gnome-shell/extensions/[email protected]/extension.js
   

3. In the following code block, change the let to_enable = true; to let to_enable = false:

   function conditionallyenabledock() {
       let to_enable = false;
       runningExtensions = ExtensionSystem.extensionOrder;
       for (let i = 0; i < runningExtensions.length; i++) {
           if (runningExtensions[i] === "[email protected]") {
               to_enable = false;
           }
       }
   
       // enable or disable dock depending on dock status and to_enable state
       if (to_enable && !dockManager) {
           dockManager = new Docking.DockManager();
       } else if (!to_enable && dockManager) {
           dockManager.destroy();
           dockManager = null;
       }
   }
   

4. Restart your session or do Alt + F2 and type restart

That's it.

I did the following steps:

• Open Dash to Dock settings
• Got to the 'Poistion and size' tab
• Check the option 'Show on all monitors'

This fixed the problem for me. Hopefully it works for you too. Also make sure Ubuntu dock is disabled.

I was facing the same problem, then I found this nxadm cluadio. It really did the trick.

1. Remove Dash to Dock extension in case that you have installed.

2. Use dconf as explained in the link. The text in this step was copied from the same link.

   To prevent Ubuntu Dock to take all the vertical space (i.e. most of it is just an empty bar):

   dconf write /org/gnome/shell/extensions/dash-to-dock/extend-height false
   

   A neat Dock trick: when hovering over a icon on the dock, cycle through windows of the application while scrolling (or using two fingers). Way faster than click + select:

   dconf write /org/gnome/shell/extensions/dash-to-dock/scroll-action "'cycle-windows'"
   

   I set the dock to autohide in the regular “Settings” application. An extension is needed to do the same for the Top Bar (you need to log out, and the enable it through the “Tweaks” application):

   sudo apt install gnome-shell-extension-autohidetopbar
   

   Just to be safe (e.g. in case you broke something), you can reset all the GNOME settings with:

   dconf reset -f /
   

Optional: You can install dconf-editor and explore other settings.

I have been playing with similar issues: Gnome favorites bar was showing in activities view and dock was showing on lockscreen; as pomsky says, all of this issues are associated with the combination of Ubuntu Dock and Dash to Dock.

I found this workaround for customize the dock with almost all the options that Dash to Dock offers:

1. Install Dash to Dock.
2. Make all your customization.
3. Remove Dash to Dock (from https://extensions.gnome.org/local/).
4. Logout and login.

Although Dash to Dock was removed, the customization (position, size, behavior, appearance) persist on Ubuntu Dock and the issues (docks overlapped, dock shows on lockscreen and favorites shows on activities view) are not present any more.

Notes: with this method, the only thing that you lost from Dash to Dock is the "Dash to Dock settings" menu from the applications icon, and of course, the Dash to Dock settings entry in Gnome Tweak Tool. I haven't tried yet, but I think that if you make a change from Dock entry in Ubuntu settings, may be some customization realized with Dash to Dock settings will be lost.

Running Dash to Dock along with the default Ubuntu Dock is not a good idea. As Ubuntu Dock is a fork of Dash to Dock (and hence they share many same schemas), issue like this is not really surprising.

Disable one of the two extensions (Ubuntu Dock and Dash to Dock) using Tweaks or in some way (refer to this if you want to disable Ubuntu Dock).