cannot load my new kernel

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http://www.unix.com – Let's open a discussion here: I am tryin to install a Real Time kernel on my Ubuntu 11.04 Server machine with size 4GB. Before this, I am tryin to install a minimal kernel required in my Ubuntu 11.4 Desktop, but you know, the boot loader cannot load my new kernel. I have also tried the instruction on my Red Hat (CentOS 6) machine and ... again the same problem. boot loader stucks in loading my kernel, (i recall it was saying error with image number) Here were the instructions: 1. tar xzf linux- 2. gunzip patch- 3. cd linux- && patch p1 < ../patch- (HowTos)