To install RStudio on Ubuntu, you can follow these steps: 1. Open the terminal. 2. Add the RStudio repository to your package sources by typing the following command: `$ sudo add-apt-repository "deb https://cloud.r-project.org/bin/linux/ubuntu $(lsb_release -cs)-cran40/"` 3. Import the repository signing key with the following command: `$ gpg --keyserver keyserver.ubuntu.com --recv-keys 51716619E084DAB9` 4. Install RStudio by running the following command: `$ sudo apt install rstudio` 5. Once the installation is complete, you can launch RStudio by searching for it in the applications menu or by typing `rstudio` in the terminal. Note: The above instructions assume you have an Ubuntu version that is compatible with RStudio's requirement of Ubuntu 20.04 (Focal) or later.