Steam is not included in the Mint repository, so you'll need to add it manually first before installing it. You can install Steam from the Steam website without doing this, but then you'll have to manually update it each time an update is released (which is very often).  deb http://repo.steampowered.com/steam/ precise steam into the address bar. sudo apt-get update. This will update your repositories. wget -O - http://repo.steampowered.com/steam/signature.gpg . Press ↵ Enter to run the command. this will download the signed key for the repository, allowing you to install software from it. The rest of the process is the same as the Ubuntu process. Click here and follow the steps to install Steam and download some games.

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Write a summary of the previous text in Indonesian:
Buka Software Sources. Pilih "Additional repositories", lalu klik "Add". Tempel (paste) . Buka Terminal, lalu ketiklah . Ketiklah . Buka Software Center, lalu ikuti instruksi yang diberikan di dalam proses pemasangan Steam untuk Ubuntu.