How to open new tab in existing terminal session and using keyboard shortcut / modifying global settings

Run gnome-terminal command and add as many --tab options as you need. For instance, gnome-terminal --tab --tab --tab will get you a new window with three tabs. Assign the command to a keyboard shortcut to achieve what your goal.

To open a new tab interactively use Ctrl+Shift+T.

gnome-terminal is the default terminal application on Ubuntu. It does have a command line option that should help:

--tab    Open a new tab in the last-opened window with the default profile

so you could create a custom keyboard shortcut with the command

gnome-terminal --tab

If you wanted to open two tabs you could create a script file like:

#!/bin/sh
gnome-terminal --tab
gnome-terminal --tab

Then call that script file from your keyboard shortcut.

CTRL + ALT + T (Open New Terminal) CTRL + SHIFT + T (Open New Tab in the terminal(Note you should not present on browser while executing this shortcut otherwise last closed browser tab will be opened)

gnome-terminal (open New Terminal) gnome-terminal --tab (open New tab in the terminal)

ALT + (tab number) ex: ALT + 1 (change to First Terminal tab) Alt + 2 (change to second Terminal Tab)

From the existing gnome terminal, right click and select Preferences, you will see the keyboard shortcuts settings on Global -> Shortcuts.