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I'm running ubuntu 14.04. I cannot use software center to install anything, even a local deb package so I have to rely on Terminal.

Recently I was trying to install mysql-server which generated error which I could pin-point was the required version of libstdc++6 . My system had 4.8.x while mysql 5.6 required >=4.9.
Trying the usual upgrading process and unsuccessful, I consulted my sys admin, who tried installing the 4.9 package manually(using a local .deb package), which failed as well citing unmet dependencies.

At present, what I have is a system with error saying no new software can be installed.

The sudo apt-get install -f gives following output:

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Correcting dependencies... failed.

The following packages have unmet dependencies:

 libstdc++6 : Depends: gcc-4.9-base (= 4.9.2-10) but 4.9.1-0ubuntu1 is installed

 libstdc++6:i386 : Depends: gcc-4.9-base:i386 (= 4.9.2-10) but 4.9.1-0ubuntu1 is installed

E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

I checked for held packages using

dpkg -l | grep ^h

dpkg -l | grep hold

Result: nothing.

Also tried to find the broken package, if any but the file
/var/log/dist-upgrade/apt.log doesn't exist.

So, what should/can I do now.

Your unmet dependencies problem is caused by the MySQL APT Repository repository. MySQL Server 5.6 from the MySQL APT Repository requires libstdc++6 >=4.9 however MySQL Server 5.6 (mysql-server-5.6) from the default Ubuntu repositories requires libstdc++6 >=4.6. When you install the version of MySQL Server 5.6 from the Ubuntu Software Center, it automatically resolves all the package dependencies for you.

To fix the problem you need to remove the MySQL APT Repository and then uninstall all the packages that you installed from the MySQL APT Repository.

To remove the MySQL APT Repository, use a command of the form:

sudo dpkg --remove package-name

where you replace package-name with the package name of the MySQL APT Repository you previously installed. Or else you can also search in the Ubuntu Software Center for the MySQL APT Repository .deb package that you installed and remove it from there.

Then install the MySQL Server 5.6 with the command:

sudo apt install mysql-server-5.6

Use "aptitude" to solve the problem.

sudo apt-get install aptitude

sudo aptitude remove mysql-apt-config

Now follow the proposed solutions.

This error occurs because the package you are trying to download and install requires libstdc++6 >=4.9. The latest version of libstdc++6 available on the Ubuntu 14.04 LTS repositories is 4.8.2-19ubuntu1, which is older than 4.9.

I'm assuming that you're running Ubuntu 14.04, because the libstdc++6 package on your computer is stuck at 4.8.2-19ubuntu1. The MySQL APT repository currently has packages for three versions of Ubuntu: 12.04, 14.04 and 14.10. The packages for 12.04 and 14.04 both require only libstdc++6 >=4.6, while 14.10 requires version libstdc++6 >=4.9.

Please check that you've installed the correct mysql-apt-config package for your Ubuntu version.

libstdc++6 : Depends: gcc-4.9-base (= 4.9.2-10) but 4.9.1-0ubuntu1 is installed

The package gcc-4.9-base (= 4.9.2-10) is only available for Ubuntu Vivid.

Check this (utopic) and this (vivid).

Remove the package mysql-apt-config, installed by these instructions and use mysql-server to get the latest version.

sudo dpkg --force-all -P mysql-apt-config

sudo apt-get install mysql-server