I searched the internet for a Linux fastboot version, and found several. But they did not work. At last I found one that worked, and would like to post it here to share it with other Linux users. I had to zip it because the forums won't let me attach a binary file.
I placed it in the same folder as adb: /android-sdk-linux_x86/platform-tools/ . I also had to run it with root permissions, in Ubuntu sudo worked for me. But I did have to then give the full path when issuing the fastboot command:
sudo /home/<user>/android-sdk-linux_x86/platform-tools/fastboot devices
This command will tell you if it 'sees' your Xoom. Replace <user> with the user that is logged in.
I won't go into detail on how to use fastboot, as that is already covered in other threads.
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