This is long, since installing a terminal will likely not be all that helpful to someone who doesn't know what a terminal program is and how to use it at a beginner lever.
'terminal' is a type of program, not a specific program. There must be 50 different 'terminal' programs and at least 1 is already installed on your system, usually based on the DE. Often, in the Administration or System menu, there will be something with "term" or "terminal" in the name. Because the menu name and the program name seldom match in Ubuntu, it is hard to guess what your system calls it. Gnome Terminal, LXTerm, Mate-Terminal, xterm, uxterm, and many, many, others. Non-Linux computers might use something like PuTTY. While PuTTY is available on Linux, almost nobody uses it there, since every other terminal program is more standard and has great features already.
A terminal is a text command window with great power. Sorta like the old MS-Dos command prompt, but much, much, more flexible. MS-Windows added at tool they call "PowerShell" in their attempt to provide a Unix terminal-like interface.
In Unix-like OSes, a terminal window usually provides the interface to your shell. On Ubuntu Desktop variants, the default shell program is bash, but there are 20 others and you can change the shell for your userid, if you like. On an Ubuntu Server, which doesn't have any GUI, the shell is all we get after login. No GUI. Just a blank screen with something like this:
That is a shell command prompt. It awaits a command, which there are many thousands of possible commands, each command has 1-50 options. So, 'find' is a command.Code:thefu@deneb:~$
Underneath the GUI you are used to seeing/using, the shell is the main tool on your system. Entire books have been written about using shells and getting the most from your shell of choice. sh, ksh, bash, zsh, fish, csh, tcsh, https://tldp.org/LDP/Bash-Beginners-...ect_01_01.html has more, if you care. A more friendly way to learn about the shell and how to use it is in this no-hassle, free, PDF book, https://www.linuxcommand.org/tlcl.php I've used that book in my Beginning Linux classes at the local University. A dead tree version can be bought in almost any book store, or the free PDF is fine too.
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