Just moved from Unity to GNOME Shell with the update to Ubuntu 17.10. In Unity I could maximize apps by placing my cursor on the app in the taskbar and scrolling.
In GNOME this doesn't work. Is there a way to enable it?
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With Ubuntu 17.10 release, Ubuntu has moved away from Unity to GNOME. There's no going back to Unity, unfortunately.
There are a lot of differences between the new Ubuntu dock and the older Unity dock. However, with a GNOME shell extension called Dash to Dock, you can get very close to the Unity experience.
From the installer page:
To control GNOME Shell extensions using this site you must install GNOME Shell integration that consists of two parts: browser extension and native host messaging application.
Instructions for both of them are mentioned there. In a nutshell,
sudo apt-get install chrome-gnome-shell
After both are installed, Dash To Dock extension can then be directly installed, enabled, and opened from the same browser window.
Using this, I was able to make my dock look like this: Customized Ubuntu GNOME dock
Here's a screenshot of the setting that will enable the "scrolling" feature: Dash to Dock scroll action behaviour
Additionally, download Ubuntu GNOME Tweak Tool for an array of customisation.