This kernel is now available in the git repository of Ubuntu 10.04 and you are able to compile your own 2.6.35 kernel for Ubuntu 10.04.
Linux 2.6.35 includes support for transparent spreading of incoming network load across CPUs, Direct-IO support for Btrfs, an new experimental journal mode for XFS, the KDB debugger UI based on top of KGDB, improvements to ‘perf’, H.264 and VC1 video acceleration in Intel G45+ chips, support for the future Intel Cougarpoint graphic chip, power management for AMD Radeon chips, a memory defragmentation mechanism, support for the Tunneling Protocol version 3 (RFC 3931), support for multiple multicast route tables, support for the CAIF protocol used by ST-Ericsson products, support for the ACPI Platform Error Interface, and many new drivers and small improvements.
Check full details from here
If you want to install Kernel 2.6.35 use the following procedure
Open the terminal and run the following commands
sudo apt-get update
sudo apt-get dist-upgrade