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I need to install the 32-bit version of on a 64 bit Ubuntu 8.04.2 server.

when i tried apt-get install ia32-libs, it says

root@devserver:~/downloads# apt-get install ia32-libs
Reading package lists... Done
Building dependency tree
Reading state information... Done
ia32-libs is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 133 not upgraded.

But when i tried to enable a PHP extension (, which uses this runtime library following error is logged in php error log.

root@devserver:~/downloads# cat /var/log/apache2/php_error.log
[01-Nov-2011 16:54:09] PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php5/20060613/' - /usr/lib/php5/20060613/ wrong ELF class: ELFCLASS32 in Unknown on line 0
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3 Answers 3

up vote 4 down vote accepted

What makes you think you need a 32-bit version of

64-bit Ubuntu runs 64-bit Apache which runs 64-bit PHP which it seems can't load 32-bit, which it tells you in the error message.

It's unlikely that installing ia32-libs will solve the problem - I would say you need 64-bit version of

It looks like pdflib's website has a separate download for x86-64 architecture - I downloaded the archive and the .so file inside it is definitely 64-bit.

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You could've used apt-get install lib32stdc++6.

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This answered the question in the title (How to install 32-bit version of on a 64 bit machine) to me. – setempler Aug 19 '14 at 0:59
Hi, When I run sudo apt-get install lib32stdc++6 its give me o/p like : The following NEW packages will be installed: lib32stdc++6 But, when I run ls /usr/lib32 Its not exist. Please let me know where I am wrong. Thanks. – AB Bolim Jul 22 at 7:03
This helped me get bison running for an Android source build on Ubuntu 14.04. – bonh Aug 27 at 3:24

The problem is not with libstdc++, it's with You need to download the 32-bit version of that library.

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