References
Most of the material covered in this chapter is available in man pages, many of which are available online.
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The InstallingSoftware Ubuntu wiki page has more information.
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For more dpkg details see the dpkg man page.
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The APT HOWTO and apt-get man page contain useful information regarding apt-get usage.
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See the aptitude man page for more aptitude options.
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The Adding Repositories HOWTO (Ubuntu Wiki) page contains more details on adding repositories.