There's an installation guide right here that will hopefully help you get started.
The three steps outlined for Linux are the following:
Navigate to the location of the installer file with a command console on the host computer.
Enter the following command in the console window: sudo sh ./st-stm32cubeide_VERSION_ARCHITECHURE.PACKAGE where VERSION, ARCHITECTURE and PACKAGE must be entered after the selected Linux® package.
Follow the further instructions provided through the console window