To install Gradle 7 on Ubuntu with Java 1.8 already installed
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Open a terminal window. 
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Update the package list: sudo apt update
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Install wget if it's not already installed: sudo apt install wget
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Download Gradle 7.6.2 (the latest version in the 7.x series): wget https://services.gradle.org/distributions/gradle-7.6.2-bin.zip
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Create a directory for Gradle: sudo mkdir /opt/gradle
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Extract the downloaded zip file to the new directory: sudo unzip -d /opt/gradle gradle-7.6.2-bin.zip
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Set up environment variables by editing the profile file: sudo nano /etc/profile.d/gradle.sh
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Add the following lines to the file: export GRADLE_HOME=/opt/gradle/gradle-7.6.2 export PATH=${GRADLE_HOME}/bin:${PATH}
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Save and exit the file (Ctrl+X, then Y, then Enter). 
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Make the script executable: sudo chmod +x /etc/profile.d/gradle.sh
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Load the environment variables: source /etc/profile.d/gradle.sh
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Verify the installation: gradle --version