/usr/share/doc/sreeglug
the community knowledge archive — documentation, tutorials, books, links
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Documentation GNU/Linux
Debian documentation
The universal OS's manuals — installation, administration and packaging, all free.
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Documentation GNU/Linux
Linux kernel documentation
Straight from kernel.org — how the kernel is built, configured and developed.
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Documentation GNU/Linux
Arch Wiki
Distro-agnostic, brutally thorough Linux documentation. When something breaks, this is where the answer usually lives.