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Long ago we wrote about the Ubuntu 9.10 ported to Nokia N900.
Recent data are as follows: on the Nokia N900 can be installed Ubuntu 12.04 (it will be released in April) and run it with the u-boot.
For details and to discuss possible on the forum.
 

• Nokia N900 and Ubuntu 9.10
• Ubuntu Mobile on the Nokia N900
• Quick install Fremantle SDK (Maemo 5). Installing Qt 4.6. Running and debugging in the emulator and on device
• Mozilla has released the release candidate of Firefox 4 for Maemo (Nokia N900)
• Nokia N900 and 64Gb memory card in the

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