I had upgraded to Ubuntu 10.4 (Karmic Koala) when it was released, having skipped a few releases. I think I had previously been using Intrepid. Anyway, when I finally got around to trying Blender in the new Ubuntu, I found that the popup menus did not work properly. The textbox inputs didn't usually work correctly either. Sometimes I could get a popup to appear by clicking a menu, moving the mouse, and waiting for the menu to appear. Sometimes I could click on a text box, type blindly into the empty box, press an arrow key to change the Frame of the timeline, and changing frames would cause the text box to repaint and show my text. It was pretty awful.
I went searching for a solution on the nets, and found this:
Blender 2.49 still had front-buffer drawing code that poses problems for some cards and drivers...
Blender 2.5 has a different drawing approach in that everything is now drawn in backbuffer.
Now, granted Blender 2.5 is still in beta. But I just downloaded the 2.53 build, and so far I'm impressed. If you had the same problem that I did, or just want to see the slick new UI, I suggest you grab it and try it out. I had nearly forgotten how to download and unzip software, having been spoiled by Apt for so long in Linux Land. Being able to bring down a built-in menu of available software is still one of my main reasons for switching, so I'll be extra excited when Blender 2.5 is available there.
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