GNU/Linux Desktop Survival Guide by Graham Williams
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Kernel Upgrades

Upgrading kernels in Debian is as trivial (generally) as installing a new Debian package. For example, if you've installed Debian kernel-image-2.6.7-1-686-smp then upgrading to a new kernel simply means:

  $ wajig update
  $ wajig install kernel-image-2.6.8-1-686-smp

Assuming you are using grub as you boot loader and you have modified the grub configuration file as described in Section 12.2, next reboot will use the new kernel (and give you the choice of booting the previous kernel, just in case).