![]() ![]() In 12.04, the package management tools have not fully been updated to be multiarch-aware. If you upgrade a 64-bit system to 12.04 (Precise Pangolin), you are likely to have a combination of libraries in the "old" /usr/lib and /usr/lib32 directories and the new /usr/lib/x86_64-linux-gnu and usr/lib/i386-linux-gnu/ directories. ![]() According to its amd64 Launchpad page if no other packages are installed that depend on ia32-libs, you can remove it. Starting with 12.04 (precise pangolin) this is a transitional package to the ia32-libs-multiarch package which depends on numerous Multi-arch versions of libraries that used to be in ia32-libs. ![]() One package for 32-bit shared library support on a 64-bit system is named ia32-libs, which included lots of 32-bit versions of shared libraries. It is unwise to disable this unless you know what you are doing. The need for 32-bit program support on a 64-bit system is indicated by a file /etc/dpkg//multiarch containing foreign-architecture i386. Multi-arch is a new way of handling this developed by Debian. If you have any need for 32-bit programs on a 64-bit system, then lots of library packages need to be installed for 32-bit support (denoted by "(i386)" in the package name) in addition to their native 64-bit versions. Most packages provided in Ubuntu repositories are available for both 32-bit (identified as "i386" on ) and 64-bit ("amd64" on ) and your computer only needs the packages for its architecture, but there are some programs that are only available for the "other" architecture, such as Wine and some browser plug-ins. If Ubuntu is working, you should not have to concern yourself with the details of how it supports different computer architectures just install the programs you like. Multiarch is a new approach to running programs compiled for one computer architecture on another, particular i386amd64 (see 32bit and 64bit for an explanation to these two architectures).
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