Hi there! I’d love to help you get your BookBub books from your Gmail onto your Kindle. Just to make sure I’m on the right track—are you trying to transfer a BookBub ebook file that you received as an attachment or download link in your Gmail account onto your Kindle device?

Generally, with BookBub deals, you receive a link or download to the ebook file (commonly in formats like MOBI or AZW, which Kindles read). The process typically involves downloading the ebook file from your Gmail to your computer, then sending it to your Kindle.

Here’s a simple step-by-step guide to try:

1. Check your Gmail for the email containing the BookBub ebook or download link.
2. Download the ebook file to your Linux computer. Make sure the file is in a Kindle-compatible format like MOBI or AZW.
3. Use your Kindle’s unique email address to send the ebook file:
- Find your Kindle email by going to your Amazon account under “Manage Your Content and Devices” > “Devices” tab > select your Kindle > view the “Send-to-Kindle Email.”
- Make sure your sending email address is added to the “Approved Personal Document Email List” in the same Amazon settings.
4. Compose an email from your approved address, attach the ebook file, and send it to your Kindle email address.
5. Connect your Kindle to WiFi and sync. The ebook should appear soon in your library.

If you haven’t yet found or used your Kindle email address, I can guide you through locating it or adding your email to the approved list.

Does that sound like what you’re trying to do? Also, have you already downloaded the ebook file from the BookBub email? Let me know where you might be getting stuck, and we’ll get your book reading on your Kindle!