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When I upgraded to 12.04 all the 32bit libraries was removed. When I used Synaptic to upgrade, Synaptic installed all the 32bit libraries. When I later used apt-get to install a ppa, I was told to use autoremove to remove all the 32bit libraries, which I did.

After this Synaptic wanted to install the libraries again, but now I marked ia32-libs forinstead. The installation works fine, but I am not able to install Skype as Skype depeneds on ia32-libs.

When I try to install ia32-libs, I get this error printout

ia32-libs: Depends: ia32-libs-multiarch

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That would be a big problem also for running Wolfram research CDF player on Linux. Since ia32-libs are needed to run the player! – Nasser Apr 28 '12 at 12:48
I don't use Skype, but can you try installing the 32 bit package of Skype? I also uninstalled ia32-libs, so I could not install the 64 bit version of Google Earth, but the 32 bit package worked. – elmicha May 1 '12 at 12:56

I had the same problem. This worked for me:

sudo apt-get purge ia32-libs
sudo apt-get install librtmp0/precise
sudo apt-get install ia32-libs
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Have you tried installing ia32-libs-multiarch Install ia32-libs-multiarch? If you get any more dependency issues, install those as well.

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That was the first I thought of, but when I look in Synaptic there is no ia32-libs-multiarch available. I also tried to download and install ia32-libs-multiarch, but that did not work either. However I just found a solution in the archived Precise development forum. Skype works if you install the 32-bit version instead of the 64-bit version on a 64-bit installation of 12.04 – P-I H Apr 28 '12 at 20:05
Ah cool, thanks for the info! – Rumbles May 1 '12 at 10:44

It's likely that those packages are missing on the mirror that you are using.

You could consider switching to a different mirror which hopefully has a more up to date package list.

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Why would some Ubuntu mirrors not have these packages? – Eliah Kagan Oct 28 '12 at 16:33
It's possible that a non-default mirror didn't sync entirely with the main server which is being used. – Carroarmato0 Oct 28 '12 at 20:08

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