Errors when booting Ubuntu

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http://askubuntu.com – I am not able to boot Ubuntu. I am facing four problems in serial and I am stating each one below: 1) When I switch on my computer the Ubuntu boots than at starting it says: the disk drive for /boot/uboot is not ready yet or not present wait or press S to skip or M to add manually. 2) After pressing S then I go to login, then after login using my password, my home screen pops a message: could not update ICEauthority file. /home/ user/.ICEauthority 3) Then I press enter, then again an error message pops saying: There is a problem with the configuration server. (/usr/lib/libgconf 2-4/i (HowTos)