How to Change The Default Terminal in Ubuntu?

How to change the default terminal in Ubuntu. It does not follow the standard way of changing the default application in Ubuntu, what should I do?
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Terminal is a key part of Linux system. It allows you to access the Linux system through the shell. There are multiple terminal applications (technically called terminal emulators) on Linux.

Most desktop environments have their own terminal implementation. Their appearance may be different, and may have different shortcut keys. For example, Guake terminal is very useful for advanced users, it provides some functions that may not be available in the default terminal of the release.

You can install other terminals on the system and set them as the default, which can be opened with the shortcut key Ctrl+Alt+T.

Now the question is, how to change the default terminal in Ubuntu. It does not follow the standard way of changing the default application in Ubuntu, what should I do?

Change the default terminal in Ubuntu
In Debian-based distributions, there is a convenient command line program called update-alternatives that can be used to handle default applications.

You can use it to change the default command line text editor, terminal, etc. To do this, run the following command:

sudo update-alternatives --config x-terminal-emulator

It will display all the terminal emulators present on the system that can be used as default values. The current default terminal is marked with an asterisk.

abhishek@nuc:~$ sudo update-alternatives --config x-terminal-emulator
There are 2 choices for the alternative x-terminal-emulator (providing /usr/bin/x-terminal-emulator).

  Selection Path Priority Status
-------------------------------------------------- ----------
  0 /usr/bin/gnome-terminal.wrapper 40 auto mode
  1 /usr/bin/gnome-terminal.wrapper 40 manual mode
* 2 /usr/bin/st 15 manual mode

Press <enter> to keep the current choice[*], or type selection number:

All you have to do is enter the selection number. For me, I want to use the GNOME terminal instead of the terminal from the Regolith desktop.

Press <enter> to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/bin/gnome-terminal.wrapper to provide /usr/bin/x-terminal-emulator (x-terminal-emulator) in manual mode
Automatic mode vs manual mode
You may have noticed the automatic mode and manual mode in the output of the update-alternatives command.
If you choose automatic mode, the system may automatically determine the default application when installing or removing software packages. This decision is influenced by the priority number (as shown in the command output in the previous section).
Suppose you have installed 5 terminal emulators on your system and deleted the default emulator. Now, your system will check which emulators are in automatic mode. If there are more than one, it will choose the one with the highest priority as the default emulator.
I hope you find this little trick useful. Questions and suggestions are always welcome.