There should be an upgrade to 3.5 somewhere in the repos. You may need to enable certain repo's; not sure where it is exactly.
If not, you have two options.
1. Try using a precompiled one (eg.
http://www.upubuntu.com/2012/09/how-to- ... 54-on.html )
2. Compile it yourself.
-Go to:
http://kernel.org/-Grab the source code from your selected kernel (I'd try 3.5.7; I think you can compile it with the default libc6)
-Unzip it somewhere convenient. You'll need at least 5 or so GB on the drive in question, and probably 1GB or so free on your root
-Open a terminal inside of the folder you extracted
-Install ncurses-devel, if you don't already have it
-Run the following:
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make menuconfig
Customize the kernel, if you want, or just exit out of there.
After that run:
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make -j4 && make modules -j4 && sudo make install modules_install -j4
where 4 is the number of threads you have available. eg. on a quad core machine you can run -j8.
The -j arguments are optional, but if you're on a multi core machine it's much faster.