ubuntu安装libpng-dev失败，libpng12-dev : Depends: libpng12-0 (= 1.2.50-1ubuntu2.14.04.3) but 1.2.50-2+deb8u3 is to be installed

依赖问题，需要先安装libpng

apt install libpng12-0=1.2.54-1ubuntu1

问题解决。

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