diff --git a/harmonic/install_ubuntu.md b/harmonic/install_ubuntu.md
index 9091725f7..90e753131 100644
--- a/harmonic/install_ubuntu.md
+++ b/harmonic/install_ubuntu.md
@@ -22,7 +22,7 @@ Then install Gazebo Harmonic:
 
 
 ```bash
-curl https://packages.osrfoundation.org/gazebo.gpg --output /usr/share/keyrings/pkgs-osrf-archive-keyring.gpg
+sudo curl https://packages.osrfoundation.org/gazebo.gpg --output /usr/share/keyrings/pkgs-osrf-archive-keyring.gpg
 echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/pkgs-osrf-archive-keyring.gpg] http://packages.osrfoundation.org/gazebo/ubuntu-stable $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/gazebo-stable.list > /dev/null
 sudo apt-get update
 sudo apt-get install gz-harmonic
diff --git a/ionic/install_ubuntu.md b/ionic/install_ubuntu.md
index 0eff95f1f..b470609fa 100644
--- a/ionic/install_ubuntu.md
+++ b/ionic/install_ubuntu.md
@@ -15,7 +15,7 @@ Then install Gazebo Ionic:
 
 
 ```bash
-curl https://packages.osrfoundation.org/gazebo.gpg --output /usr/share/keyrings/pkgs-osrf-archive-keyring.gpg
+sudo curl https://packages.osrfoundation.org/gazebo.gpg --output /usr/share/keyrings/pkgs-osrf-archive-keyring.gpg
 echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/pkgs-osrf-archive-keyring.gpg] http://packages.osrfoundation.org/gazebo/ubuntu-stable $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/gazebo-stable.list > /dev/null
 sudo apt-get update
 sudo apt-get install gz-ionic