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I just upgraded our machine from Ubuntu 14.04 to Ubuntu 16.04.1. After the upgrade, the desktop no longer opens. I just got to a black screen.

Also, when I tried to run sudo apt followed by anything, I got the following error:

apt-get: relocation error: /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0: symbol _ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE7compareERKS4_, version GLIBCXX_3.4.21 not defined in file libstdc++.so.6 with link time reference

Any help is great appreciated. Thanks.

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Having the exact same problem. Were you able to fix? – CentAu Aug 3 '16 at 19:44
    
@CentAu Yeah, the answer below fixed it for me. After downloading/re-installing the package, I updated and upgraded again, and now everything seems to be working. – Shawn Fahl Aug 4 '16 at 21:53
    
@ShawnFahl If the below answer worked for you, accept it as the best answer :) – kevlarjacket May 2 '17 at 15:32
up vote 3 down vote accepted

After upgrading from 14.04 to 16.04.1 I got the exact same problem. Just start your Ubuntu and press Ctrl+Alt+F1 to enter on console and then download and re-install the package libstdc++6_5.3.1-14ubuntu2.1_amd64.deb via dpkg -i :

wget http://launchpadlibrarian.net/259210936/libstdc++6_5.3.1-14ubuntu2.1_amd64.deb
sudo dpkg -i libstdc++6_5.3.1-14ubuntu2.1_amd64.deb

After that apt-get works fine, but I got some errors (due to mySQL and another installed libc). I try to remove those via apt-get remove which returns an error. Then I just run the command suggested by apt-get and now everything works fine.

Found the solution here: Upgrade from 14.04 to 16.04 dependency issues

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I shorten the URL into goo.gl/NdPv2P, if you don't care about getting tracked by Google. – Franklin Yu Dec 20 '16 at 23:33

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