It turns out that, if you poke around enough at the boot: prompt, you get told about an option for where to find the images to upgrade from. So, a couple of hours of installation later and a couple of hours more of package upgrades later, here I am. Yay.
No big differences are yet obvious. Some different fonts in my browser, a second toolbar appeared on top of the screen (which I have summarily dismissed), but everything seems to have proceeded smoothly.
Next time I’ll probably not wait as long after the OS is released before upgrading. And I’ll know that I only have to burn one image to a CD, and it doesn’t even have to work very well: it just has to work well enough to get into the installer.
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