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man vlock says to look in /usr/src/linux/Documentation/sysrq.txt. This file isn't there (though it's available online). Why?

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The kernel documentation can be found in the linux-doc package. Once that is installed, you should be able to find the file under /usr/share/doc/linux-doc.

The /usr/src/linux/Documentation location is a bit of an anachronism. It used to be common to unpack the Linux kernel source code under /usr/src/linux, which would have placed the documentation in the location you mentioned. However these days most people use the pre-built kernels from their distribution, and even if they do build their own kernel they are likely to do it in their home directory instead.

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