LINUX runs the Google servers that manage billions of searches each day. It also runs the TiVo digital video recorder, the Motorola Razr cellphone and countless other electronic devices.

But why would anyone want to use Linux, an open-source operating system, to run a PC? “For a lot of people,” said Jim Zemlin, executive director of the Linux Foundation, “Linux is a political idea — an idea of freedom. They don’t want to be tied to Microsoft or Apple. They want choice. To them it’s a greater cause.”

That’s not the most compelling reason for consumers. There is the price: Linux is free, or nearly so.

Unlike Windows from Microsoft and OS X from Apple, Linux is not owned, updated or controlled by a single company. Thousands of developers around the world work on Linux, making improvements and issuing new versions several times a year. Because the core Linux software is open source, these developers have the right — some would say responsibility — to borrow from one another’s work, constantly looking for enhancements.

But Linux has always had a reputation of being difficult to install and daunting to use. Most of the popular Windows and Macintosh programs cannot be used on it, and hand-holding — not that you get that much of it with Windows — is rare. But those reasons for rejecting Linux are disappearing.

Until recently, major PC makers shied away from Linux. Now the industry is watching as Dell is selling two Linux-equipped desktop models ($549 and $870, including a monitor) and a $774 notebook PC. (Hewlett-Packard offers Linux systems to businesses, and Lenovo, the Chinese company that bought I.B.M.’s PC division, sells Linux machines in China and says it will soon offer Linux-based computers in the United States.)

The Ubuntu version of Linux runs the Dell computers. Because Dell does not have to pay a licensing fee for the operating system, the computers are $80 cheaper than PCs with Windows Vista Home Premium or $50 cheaper than the stripped-down Vista Basic edition.

Ubuntu is generally regarded as one of the more consumer-friendly versions of Linux, so the Linux PC experience is similar to what you would get with a Windows-equipped Dell. When you start the machine, the screen looks familiar; preinstalled applications can easily be found and run from an Applications menu at the top left of the screen. A “Places” menu lets you search for files, and a System menu is there for setting preferences and finding help.

And there is a lot more than just an operating system. Ubuntu, like some other Linux distributions, comes with a lot of free software, including OpenOffice, an alternative to the Microsoft Office suite with a full-featured word processor, spreadsheet, database and presentation program. It also comes with the popular Firefox Web browser as well as an e-mail program, an instant messaging program, a graphic image editor, music player and a photo manager.

Thanks to open source developers, there are thousands more free programs. An Add/Remove function actually makes finding programs easier with Linux than it is for Mac and Windows. Without having to go to Web sites, it lets you browse through categories of software. It took me only seconds to find several additional music players, a PDF reader and other programs. In addition to downloading the software, this feature installs it and finds any necessary additional files.

You do not have to buy a new Dell PC to try Linux. You can order a free CD or download a copy of Ubuntu at ubuntu.com. The Ubuntu CD can be used to install Linux on a PC’s hard drive, or you can boot from the CD to test-drive the operating system on a Windows machine or an Intel-based Mac, without having to install or delete anything. Running Ubuntu from a CD is considerably slower than from a machine’s hard drive but all the functions are there, so it’s a good way to get a feel for how it works.

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