Recently, Ubuntu change the UI back to GNOME.
Back on 16.04, when the UI was Unity, in order to change the application switcher, I just needed to install Compiz Config System Manager (ccsm), select another application switcher and disable the keyboard switching for Unity (in ccsm as well).
In 17.10 and 18.04, where GNOME is used instead of Unity, I can enable a different application switcher on ccsm but GNOME's application switcher still kicks in and don't see an option to disable it.
Any idea how to replace the application switcher on Ubuntu versions 17.10 and 18.04?
On Ubuntu 17.10 and Ubuntu 18.04 with the Gnome Shell desktop, which uses mutter rather than compiz for managing windows, you can use different application switchers by installing appropriate extensions. Alternatetab is an officially supported extension that provides you with a document based switcher, rather than the default application based switcher. Coverflow Alt-Tab allows switching windows in a cover-flow manner. These extensions can be installed from Gnome extensions.