Debian provides a configurable generic terminal called x-terminal-emulator
(a special package), which is a symbolic link to a particular terminal emulator. You can change this using the command
sudo update-alternatives --config x-terminal-emulator
That will give you a command-line menu allowing you to select a preferred terminal from those which you have already installed.
There are some special cases where xterm
is used because none of the alternatives provide the given functionality. But if all you need is a terminal, then Debian policy is to use x-terminal-emulator
instead of a particular terminal name. (Occasionally there are bug-reports for cases that have been overlooked).