How do I resolve `The following packages have unmet dependencies`

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If sudo apt-get install -f <package-name> doesn’t work, try aptitude:

sudo apt-get install aptitude
sudo aptitude install <package-name>

Aptitude will try to resolve the problem.

As an example, in my case, I still receive some error when try to install libcurl4-openssl-dev:

sudo apt-get install -f libcurl4-openssl-dev

So i try aptitude, it turns out I have to downgrade some packages.

The following actions will resolve these dependencies:

    Keep the following packages at their current version:
    1)     libyaml-dev [Not Installed]                        

Accept this solution? [Y/n/q/? (n)

The following actions will resolve these dependencies:

    Downgrade the following packages:                                
    1)     libyaml-0-2 [0.1.4-3ubuntu3.1 (now) -> 0.1.4-3ubuntu3 (trusty)]

Accept this solution? [Y/n/q/?] (Y)

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