[ubuntu-in] Kernel update problem

[mallikarjun arjun]

After updating my kernel to 2.6.24-21 my system output from command "uname
-a" is "Linux ubuntu 2.6.24-17-generic #1 SMP Thu May 1 14:31:33 UTC 2008
i686 GNU/Linux"

anyone know how to change it to 2.6.24-21?
Mallikarjun
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