Ubuntu 12.04.4 LTS has been finally released on Feb 6, 2014. Here’s how to upgrade from previous Ubuntu 12.04 releases.

Colin Watson announced in lists.ubuntu.com:

The Ubuntu team is pleased to announce the release of Ubuntu 12.04.4 LTS (Long-Term Support) for its Desktop, Server, Cloud, and Core products, as well as other flavours of Ubuntu with long-term support.

As with 12.04.3, 12.04.4 contains an updated kernel and X stack for new installations on x86 architectures.

As usual, this point release includes many updates, and updated installation media has been provided so that fewer updates will need to be downloaded after installation. These include security updates and corrections for other high-impact bugs, with a focus on maintaining stability and compatibility with Ubuntu 12.04 LTS.

How to upgrade to Ubuntu 12.04.4: (Thanks to h1repp from askubuntu)

The normal software updates will bring your system up to 12.04.4, but the Hardware Enablement Stack (HWE; the *-lts-saucy packages) is not part of those updates (by policy).

You can install the HWE packages manually, but there are some caveats.

To upgrade use this command line only (press Ctrl+Alt+T to open the terminal):

sudo apt-get install --install-recommends linux-generic-lts-saucy xserver-xorg-lts-saucy libgl1-mesa-glx-lts-saucy

The –install-recommends is important. It makes sure that the xserver will install completely. Without it, xserver will only install partly, and apt will remove most of your system.

When you upgrade like this you may notice that there are configurations left over, among others those of the original xserver-xorg. You can purge them (I always do), but beware: this will remove the symlink /etc/X11/X that is used to start the XServer, so on next boot it won’t start. To prevent this, after purging left over configurations, do the following before the next boot:

sudo dpkg-reconfigure xserver-xorg-lts-saucy

This will recreate the necessary symlink and everything is fine again.

You can also download Ubuntu 12.04.4 iso with the new Saucy HWE stack at:

releases.ubuntu.com/precise