Ubuntu, best Linux distribution ever!
If it comes to Linux distributions, I always recommend Ubuntu. Ubuntu community is growing constantly and Ubuntu distributions have the best support available.
Over the years, I have used several distros. For example, in school I used Fedora Core, which is quite good for testing servers and desktop implementations. This Linux distro is intensive promoted on universities and is quite well supported.
After graduation and after installing the first production server, which requires a high uptime and stability, I’ve choose Suse Linux Enterprise Server – SLES (Linux distribution provided by Novell, partly freeware). With this distro I had serious problems, especially with uncontrollable resets (eg after a freeze). After a reset, we often encountered problems with RAID partitions or loss of critical data files.
In recent years, seeing the explosive growth of the Ubuntu community, I opted to install Ubuntu on my server and all my desktops. I’m very happy, very high uptime and minor problems caused by resets. In addition, Ubuntu has many installation and configuration tutorials. Ubuntu support forums are well-coordinated and structured, providing multilingual support.