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bgoonz/soln-to-old-lockfile-error-npm.md

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First, try entering this: sudo dpkg --configure -a

This will go a long way toward fixing broken dependencies. If that does not suffice, try: sudo apt-get install -f

Then clean and update: sudo apt-get clean && sudo apt-get update

Then upgrade: sudo apt-get upgrade (say 'y' to upgrades)

If you get a message saying some packages are "held back", do this:

sudo apt-get dist-upgrade

Now do these two commands:

sudo apt-get purge zlib1g-dev
sudo apt-get autoremove

Then see what happens when you enter: sudo apt-get install libssl-dev

If it still doesn't work, try this:

sudo aptitude install libssl-dev zliblg-dev=1:1.2.8.dfsg-1ubuntu1

If it still doesn't work, open up Synaptic Package Manager (It should be in your Launcher. If you can't find it, then at the Terminal enter synaptic-pkexec).

Search for zlib1g-dev. If the box next to zlib1g-dev is not green, click on it and select "Mark for installation". If you see more than one version, pick 1:1.2.8.dfsg-1ubuntu1 . Then search for libssl-dev. If the box next to libssl-dev is not green, click on it and select "Mark for installation".

Then select "Apply".

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