Hrmph, you mean GD wasn't installed?

I couldn't embed thumbnail sizes on my new WordPress install on my new Ubuntu server; I could only embed the original size (which was 3072×2048). The options to embed other sizes were just grayed out. It turns out that the default LAMP install doesn't include php-gd, the graphics library that creates thumbnails. Well… I guess that's easy enough to fix:

apt-get install php5-gd

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