direktori /usr/src/linux dimana tempatnya?

Alo rekan balinux
saya mau upgrade kernel, pas saya baca manual upgrade perintahnya adalah 
menghapus bagian /usr/src/linux...
Tapi pas saya cari kok tidak ada ya? dimana tempatnya? 
 
OS mandrake 9.0 kernel 2.4
 
Terima Kasih Atas Sarannya

                
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