Ubuntu is the modern, open source operating system on Linux for the enterprise server, desktop, cloud, and IoT.

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sourceforge provides free & fast open source software downloads and development, and business software reviews and comparisons featuring the largest open source and business software directory.

a help and support forum for ubuntu linux.

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Drive innovation in your enterprise with trusted open source from Canonical — simple, cost-effective, and supported.

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linuxquestions.org offers a free linux forum where linux newbies can ask questions and linux experts can offer advice. topics include security, installation, networking and much more.