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Why is the version number of a package in Ubuntu repositories so different from its original one?

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Why is the version number of a package in Ubuntu repositories so different from its original one?

In synaptic I saw okular 4:4.13.3-0ubuntu0.1, and on okular website, the latest stable one is Okular 0.21.

Why is the version of the Ubuntu one so different?

How can I find out the actual version of okular in the Ubuntu one?

my Ubuntu is 64-bit 14.04.

Thanks.

答案1

I believe that the 4.13.3 part of version number does refer to version of KDE applications and not the version of okular. In July 2014 KDE updates applications to version 4.13.13 and as you can see on the download page okular package has version 4.13.3.

As from the okular website :

The last stable release is Okular 0.21, shipped as part of the KDE Applications 14.12 release.

the okular 0.21 was shipped with KDE version that is not currently in repository for 14.04 Trusty.

You can find the version of okular offered in rep. by looking at Okular website's news and finding which okular version was shipped with KDE version you see in Ubuntu reps.

答案2

The answer here is just so simple that it will likely get caught in the low quality answer queue. Simply drop to a terminal and issue the command okular --version or okular -v.

Source: http://stuff.onse.fi/man?program=okular&section=1 and/or man okular

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