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While Vivaldi isn't available on the Google Play Store for all Chromebook models, you can easily install the fully-featured desktop version using the Linux container. Step 1: Enable Linux on Your Chromebook
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Now that Linux is active, you need the right installation file. Go to the official Vivaldi Download page. Look for the section.
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Once the download is finished, you can install it directly through the Files app. Open the app on your Chromebook. Go to your Downloads folder. Right-click the Vivaldi .deb file. Select Install with Linux .