I'm thinking about buying a new graphic card. What should I do before removing the old one, other than removing proprietary drivers?
I like Oli's answer. :)
The only thing I might add if your paranoid about picking a new card and want to be extra cautious would be to check the Ubuntu hardware catalog for video compatibility with your specific card choice.
Have a cup of tea.
But seriously, that's about all you want to do and you don't even need to do that before you rip it out.
Any old-config issues can be resolved fairly swiftly when the new graphics card is in. If you have issues,
These are things you can do before changing but it makes very little difference.