The computers, which come with a price tag starting at $599, will have the Ubuntu 7.04 Linux system, it said.
The move is a result of customer feedback, where Linux enthusiasts wanted the system pre-installed, the company said.
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Linux is the most popular variant of open-source software.
Unlike proprietary software, open-source software lets developers share code and add functions, and users only pay for custom features, maintenance and technical support.