>   1. One machine has existing windows. It had ubuntu 8.04 . I deleted the
>   partition  so I could install ubuntu 9.10 . Now the machine refuses to
>   recognise usb stick, usb CDROM so I cannt even boot from them.

Boot from the windows CD using the conventional optical drive and
enter recovery console. type "fixboot /mbr".  Reboot.

>   2. Other laptop : i thought I will not touch the system that is working
>   fine( ubuntu 9.04) So I used USB CDROM and ubuntu 9.10 disc on it to create
>   a usb stick for 9.10. I did boot from USB CD and chose the stick to install
>   and chose not to install grub as I wanted only one OS on the stick and
>   thought grub will be redundant. (While installing it had asked location of
>   grub on HD(0) etc and that was not relevant . I thought). So I happily ended
>   the process disconnected USB CD ROM drive and restarted the laptop and again
>   I got the sacry 'grub rescue >' prompt

Boot from Ubuntu, enter rescue mode, type grub-install /dev/hda   (or
sda or XXX depending on your partition layout.)

Regards,
NMK.
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