ubuntu - Apt-get version (build) sepecification -


could explain me "+build-ubuntu" part means? 

sudo apt-get install firefox=45.0.2+build1-0 sudo apt-get install firefox=28.0+build2-0ubuntu2

ubuntu has couple of patches make firefox run flawlessly on environment , play nicely versions of libraries (i.e. libc). theese patches not part of firefox, handled ubuntu maintainers. in order keep track of level of theese patches, ubuntu adds string original upstream version mozilla firefox.

ubuntu maintainers can increment part of version changing suffix string +build2-0ubuntu2 +build2-ubuntu3. @ same time upstream firefox can increment main part of version - , new version bigger, independent ubuntu patch version.

also might used add security patches in new firefox versions old versions of firefox (without updating whole firefox version). due nature of ubuntu not update versions of packages within release (i.e. ubuntu 16.04. sticks version of packages when released in april 2016).


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