Tell you how to remove the old kernels after upgrading to Gutsy

I upgraded my Ubuntu 7.04 to 7.10 Test 5 just now,but I found my main partition lost almost 1G space.The reason is that upgrade system will not delete your old kernels automatically while upgrading Ubuntu. The old kernels take much space of partition and normally we seldom use those order kernels again,let's delete them in save way for freeing more space.

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