I did something like:
apt-get install i2c-tools


@Kymera76: Are you sure you should be doing this? You are asking pretty basic questions about stuff you are expected to know already.

With this kernel my camera app won't start and I cannot take photos. I will have to go back to the original Nokia kernel - which if fine for people who have this kind of experience but may cause problems for someone like yourself.

You have to be prepared to flash your device and install different kernels to keep you n900 in a usuable state. If anyone is not familiar with this type of thing then it is best to stay away until the software becomes more stable.

If anyone is having trouble following the basic steps or do not understand some of the posts then I strongly suggest you keep away - it will cause you nothing but grief and may leave you n900 is a non-working state.that you cannot fix yourself.