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I managed to break my package management.
If I try to make an upgrade, I get:

$ sudo apt-get dist-upgrade

Reading package lists... Done

Building dependency tree       

Reading state information... Done

You might want to run 'apt-get -f install' to correct these.

The following packages have unmet dependencies:

 libapt-pkg4.12 : Breaks: libapt-pkg4.12:i386 (!= 0.8.16~exp12ubuntu10.3) but 0.8.16~exp12ubuntu10.2 is installed

 libapt-pkg4.12:i386 : Breaks: libapt-pkg4.12 (!= 0.8.16~exp12ubuntu10.2) but 0.8.16~exp12ubuntu10.3 is installed

E: Unmet dependencies. Try using -f.

Then I try to follow apt-get recommendation:

$ sudo apt-get -f install

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Correcting dependencies... Done

The following packages will be REMOVED:

  libapt-inst1.4:i386 libapt-pkg4.12:i386

0 upgraded, 0 newly installed, 2 to remove and 33 not upgraded.

48 not fully installed or removed.

After this operation, 3 866 kB disk space will be freed.

Do you want to continue [Y/n]? 

E: Internal Error, No file name for libapt-pkg4.12

Kubuntu 12.04 64bit. Can anyone help me to solve it?

Run:

dpkg --configure -a

and try again.

You can also download the libapt-pkg package from here and install it manually:

If the above commands don't work:

Update: The command below doesn't work. Download the appropriate version directly at http://security.ubuntu.com/ubuntu/pool/main/a/apt/.

Download the package using the following command:

wget http://security.ubuntu.com/ubuntu/pool/main/a/apt/libapt-pkg4.12_0.9.7.1ubuntu2_amd64.deb

Now remove the currently installed package:

sudo dpkg --force-depends -r libapt-pkg4.12

sudo dpkg --force-depends -r libapt-pkg4.12:i386

Then, install the downloaded package:

sudo dpkg -i libapt-pkg4.12_0.9.7.1ubuntu2_amd64.deb

Run, the following command again and check:

sudo apt-get -f install 

This is how I did it:

First, I downloaded this 2 deb files:

apt_0.9.7.7ubuntu3_i386.deb

libapt-pkg4.12_0.9.7.7ubuntu3_i386.deb

Second, I run this command:

sudo dpkg --force-depends -r libapt-pkg4.12

Then I install the 2 deb files with this command:

sudo dpkg -i apt_0.9.7.7ubuntu3_i386.deb libapt-pkg4.12_0.9.7.7ubuntu3_i386.deb

and it works....

I had the dependency apt, apt-get, apt-key error on my debian stretch and after thousands of browser tabs, reboots and program crashes, I solved it by purging the apt version I had and re-downloading and installing the latest apt here and got => (apt_1.8.0_alpha2_amd64.deb) which solved my problems. from (manual) download folder, rundpkg -i apt_1.8.0_alpha2_amd64.deb as root.