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Can ubuntu 64 bit run ubuntu 32 application?

Now all our pcs and laptop are i7, 16GB memory.

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marked as duplicate by Luis Alvarado Apr 2 '13 at 2:28

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Yes it can. The only thing you will start seeing is that any 32 Bit app will end with ":386". Here is an image to give you an idea:

enter image description here

As you can see, you ca try to install skype using the 32 bit version skype:i386). Same goes for pidgin and any other app that has a 32 bit version in a 64 bit system. Most apps do. If the 64 bit version is not available, they will most likely fallback to the 32 bit one.

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I knew mac and windows can run 32 bit app on 64 bit os. But why in ubuntu office website, they are still recommend 32 bit os. Is it not stable? I also notice apple start to sell their 64 bit os 10 years ago. –  王子1986 Apr 2 '13 at 2:41
    
@王子1986 It's just a recommendation based on the amount of users using 32 bit versus 64 bit. I can say from experience when I moved to 64 bit in 12.10 that most bigger problems with 64 bit were gone. I tested long before 64 bit and still have issues as mentioned here: askubuntu.com/questions/19803/… but usign 12.10 and most recently, testing out the 13.04 development version I can surely say that it is very stable. –  Luis Alvarado Apr 2 '13 at 3:06
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Yes, assuming the requisite 32-bit dependencies of the application are installed. There are some applications which are 32-bit only, but installable and usable on 64-bit Ubuntu, from the partner repository.

You can't mix architectures within the same process though, so a 32-bit program can't load 64-bit shared libraries, or vice versa.

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