Can i upgrade my linux Kernel 2.6.38 to the new one 184.108.40.206? Is it safe and stable to upgrade it in my Ubuntu Natty?
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The Ubuntu Kernel team have a PPA which they maintain with the latest version of the kernel for Natty - having just checked, the current version in the repo is 2.6.39-0.5
If you want to test more vanilla Kernel Builds then the kernel team also do nightly builds as well as builds for each release candidate.
For example - the new v3 kernel builds are available - these are tagged as -oneric. Obviously these builds are specifically been built for the next version of ubuntu in mind. Also, if you install them, you'll need to keep up-to-date yourself.
Change info for Kernel 2.6.39
However - there is little point in upgrading a kernel unless you are having serious issues with you current official Natty kernel. What do you expect to gain?
Is it "safe and stable" - arguable terms. Linus T calls it stable. There are many thousands of users using 2.6.38 in Natty and many of the latest distros.
I installed it.
NOT stable, had serious issues with my ATI card, ran occasionally with Unity but usually just failed to load the GUI, ran OK in Failsafe mode - but what fun is that?
I'm anything but an expert but I had a lot of difficulty getting back to the previous kernel.
Obviosly works for some, but unless you are prepared for fun and games ....