Ubuntu releases occur every six months from Ltd, the original developer. Each new version of Ubuntu, in addition to its name, uses the year and month of release as its serial number. The first release of the shell, for example, was called Ubuntu 4.10 and was released on October 20, 2004. Therefore, numbers for future versions are preliminary; if the release is delayed until another month (or even year) relative to the planned one, the distribution number will change accordingly.
How do releases happen?
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