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I am using Fedora core version 2.6.9-1.667 and I need to upgrade to 2.6.9-1.681 at school...My professer wants me to have an option to go back to the old version...Like a choice to pick either or....I have the upgrade but it does not give me a choice. I just click and it installs..How can I get a choice or go back to the first version??????????????????
Since you should be learning this I will mention a few points.
Usually when you install a new kernel you are not replacing the previous kernel. Both should still be on your system.
Perhaps a check in the /boot directory would show this to be the case.
The option to choose to boot into either kernel would be an option available within your bootloader (Lilo, Grub, or ?).
It depends on how you installed the new version. Did you delete everything on the old partition or install it on a new one? By the way, creating posts with useful titles are more likely to get someone to help you. Here's what it says below "Subject" when you are creating a new post:
Please try to be as descriptive as possible. A subject that accurately describes your problem will make your thread much more likely to get a quick response.
Bad: "Help Me!!" or "URGENT"
Good: "Why is my mouse pointer wrong?"
Best: "Mouse pointer distorted on XFree86 4.3 with Geforce FX 5200"
If I understand what you mean, I use grub as my bootloader, and have 3 kernels installed on my system. All of which I can access at boot by using the cursor keys to select which kernel to boot. If you are manually installing a kernel using rpm DO NOT install it by
rpm -Uvh <kernel>
This will UPGRADE the existing kernel leaving no previous kernel to boot if it fails!
rpm -ivh < kernel>
Then you will have to kernels to boot. The grub entry will automatically be entered.
If you search on this website and google, you will find several guides for recompiling the linux kernel. Also, can you give your threads more meaningful titles which actually show what the exact problem is.