Snipping Tool on Linux

Snipping Tool comes with Windows, so it won't be on a new Linux PC. This free app does the same job, and TuxPick installs it for you.

Flameshot

Also on Windows

Takes screenshots and lets you draw arrows, boxes and text on them.

Installs from Ubuntu's own software archive.

Press the install button above. TuxPick opens with the app already ticked. Add anything else you need.
Download the installer file.
Open a terminal with Ctrl Alt T, run the one line TuxPick shows you, and type your password when asked.

It works on Ubuntu 22.04 and 24.04, and on systems built on them like Zorin OS and Pop!_OS.