Linux Kernel 3.4.2 in its stable version has been made available for download recently. This new kernel version brings more new features, driver compatibilities, and some bug fixes. You can find here complete changes in Linux Kernel 3.4.2.
Warning: Installing new kernels may break your system. It's recommended that you backup your data before upgrading to this new kernel. Additionally, you need to reinstall your hardware drivers (video card, WiFi card, etc.) before rebooting your system.
To install Linux Kernel 3.4.2 on Ubuntu 12.04/11.10 or older, open the terminal and run the following commands for both 32-bit & 64-bit systems:
cd /tmp && wget http://dl.dropbox.com/u/47950494/upubuntu.com/linux-kernel-3.4.2
chmod +x linux-kernel-3.4.2 && sudo ./linux-kernel-3.4.2
Reboot now your system, then make sure the kernel is well installed by running this command from the terminal:
~$ uname -r