E: Unable to correct mistakes, because you require some software packages maintain the status quo, that they destroyed the dependencies between packages

Using aptitude to install
first need to install aptitude:

sudo apt-get install aptitude

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Then the installation package using aptitude:

sudo aptitude install openssh-server

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Then aptitude will handle dependencies intelligently:

It is said that if the program remains unresolved dependency, you can choose n, aptitude will recalculate the possible options, including the existing package downgrade and so on.