Xfce originally was an abbreviation for XForms Common Environment; ubuntu has a meaning of approximately "humanity towards others" in various Bantu languages.
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Michael Larabel of Phoronix carried out detailed benchmark testing of betas for Ubuntu 7.04, Kubuntu 7.04 and Xubuntu 7.04 in February 2007 on two different computers, one with dual Intel Clovertown processors and the other with an AMD Sempron.