I have an early Raspberry Pi model running the Raspbian OS "jessie" release (which lacks Python 3.6 and its useful "f-string" format syntax.) So, I wanted to upgrade to the contemporary "buster" release to resolve that issue. Here's what worked:
- Follow these excellent instructions (Use the section "Update Raspbian to the Latest Version") to manually update OS releases sequentially. So, in my case, I upgraded from "jessie" to "stretch" and then from "stretch" to "buster."
- You'll likely want to upgrade the Docker packages, too. To do it, refer to the following steps:
- Remove the existing Docker installation (See "Uninstall old versions.")
- Download and run the "Convenience Script" (See "Install using the convenience script") to do the upgrade installation.
