Because the EEE PC 900 was on sale so I buy one.
The first action was to install ubuntu on the EEE PC, I try the eeebuntu distribution
download the iso and burn it to the Memorystick
https://help.ubuntu.com/community/Installation/FromUSBStick
boot from the Memorystick and the Installation works right out of the box.
Then start a first update and try my 3G Modem, after the last kernelupgrade and remove the PIN it just works.
The only Problem right now is the defect Battery, it just works for 20min.