decompress the downloaded archive
tar xvf ideaIU-2020.3.tar.gz
Move the extracted files to opt directory
sudo mv idea-IU-203.5981.155/ /opt/idea
Create a shortcut
cd /usr/share/applications sudo gedit idea.desktop
Paste the below content and save the newly created file
[Desktop Entry]
Name=IntelliJ IDEA
Type=Application
Exec=/opt/idea/bin/idea.sh
Terminal=false
Icon=/opt/idea/bin/idea.png
Comment=Integrated Development Environment
NoDisplay=false
Categories=Development;IDE;
Name[en]=IntelliJ IDEA
Install the shortcut file
sudo desktop-file-install idea.desktop source ~/.bashrc
Now search Intellij, you will see it will appear in the apps menu