Hi! Can you try to check if you’ve created the file in insync.list? If you’re not sure, just head to our downloads page here and click “Download for Linux”. A pop-up will show three tabs – Installers, Packages, and Repositories. Click the last one and read through the instructions.
Let me know if after reading and following the instructions, it still won’t let you update. Please provide any output generated afterwards.
Thank you!