How to find packages when updating Ubuntu and creating standard source.list file

Question

I just upgrade to Ubuntu 14.04 LTS, amd64. I'm trying to install some software and it says for Ubuntu 13.10 and above, the following libraries need to be installed for 32-bit compatibility components:

sudo apt-get install libgtk2.0-0:i386 libxtst6:i386 libpangox-1.0-0:i386 \
libpangoxft-1.0-0:i386 libidn11:i386 libglu1-mesa:i386 \
libncurses5:i386 libudev1:i386 libusb-1.0:i386 libusb-0.1:i386 \
gtk2-engines-murrine:i386

I know when I had Ubuntu 13.10 I was able to download these packages, but now that I updated, none of these packages can be found:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package libgtk2.0-0
E: Couldn't find any package by regex 'libgtk2.0-0'

How do I go about finding these packages in Ubuntu 14.04 LTS, amd64? Why could I find them in 13.10 and they no longer exist in 14.04? Did these things get renamed and moved around? How do I find out and resolve this issue? How do people resolve these issues when updating Ubuntu? Thanks in advance.

Edit

I get this error message when running commands suggested below:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package libgtk2.0-0
E: Couldn't find any package by regex 'libgtk2.0-0'
E: Unable to locate package libxtst6
E: Unable to locate package libpangox-1.0-0
E: Couldn't find any package by regex 'libpangox-1.0-0'
E: Unable to locate package libpangoxft-1.0-0
E: Couldn't find any package by regex 'libpangoxft-1.0-0'
E: Unable to locate package libidn11
E: Unable to locate package libglu1-mesa
E: Unable to locate package libncurses5
E: Unable to locate package libudev1
E: Unable to locate package libusb-1.0
E: Couldn't find any package by regex 'libusb-1.0'
E: Unable to locate package libusb-0.1
E: Couldn't find any package by regex 'libusb-0.1'
E: Unable to locate package gtk2-engines-murrine

Solution

This command automatically installs i386 packages:

sudo dpkg --add-architecture i386
sudo apt-get update

If you want to remove i386 libraries:

sudo dpkg --remove-architecture i386

Source: Debian Multiarch HowTo

If it still doesn't work, create a new sources.list from http://repogen.simplylinux.ch. This is what you'll need for a standard, clean sources.list:

Always backup the current file:

sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup

Restore with:

sudo mv /etc/apt/sources.list.backup /etc/apt/sources.list

Comments

[terdon]

Well, the package exists, have you run sudo apt-get update? Are your sources pointing to the main Ubuntu repos?

[user1527227]

Yes I ran update/upgrade. Everything is the latest.

[Admin]

Sorry, I got mesed up.

[user1527227]

Ok so what procedure should I follow? adding i386 by sudo dpkg --add-architecture i386 and then running the commands again, but no packages downloaded.

[Cornelius]

@user1527227 what software are you trying to install that requires i386 libs?

[user1527227]

LPCXpresso for NXP microcontrollers. lpcware.com/lpcxpresso/downloads/linux . I read the user manual for version 7(lpcware.com/system/files/LPCXpresso_User_Guide_1.pdf) in section 2.2.2 of page 8, it says to run the commands I listed up in the question stem.

[Cornelius]

@user1527227 This command works on my 14.04 x64: sudo apt-get install libgtk2.0-0:i386 libxtst6:i386 libpangox-1.0-0:i386 libpangoxft-1.0-0:i386 libidn11:i386 libglu1-mesa:i386 libncurses5:i386 libudev1:i386 libusb-1.0:i386 libusb-0.1:i386 gtk2-engines-murrine:i386. Try it!

[user1527227]

I did exactly what you wrote. Please see edit above for errors... I ran these commands before for ubuntu 13.10 32-bit and it worked. it just hasnt worked since i updated @Cornelius

[user1527227]

Can you post your /etc/apt/source.list file in your answer please? @Cornelius