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RedHat and CentOS are binary compatible. So everything that works on the one will most propably work on the other (same RPMs, same libs, same versions, same dependencies)...

Does the same hold true when comparing Ubuntu LTS with Debian? When trying to build up a mirror for Ubuntu LTS I noticed that the packages were coming from a Debian repository...

Will everything work the same in the same sense it does with RH/CO, or is this a day/night difference (like OpenSuSE compared with SLES)?

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Ubuntu is derived from Sid, the unstable and rolling release version of Debian, every Ubuntu major release is nothing more than a Sid freezed at a certain point in time and enriched with everything that transform a Debian into an Ubuntu distribution.

The answer to your question is no.

Some libraries are also placed in directories with different naming convention, the Ubuntu kernel is not even close to the vanilla flavour and is full of patches.

Keep also in mind that Canonical, considering what its business is, is contributing literally zero to the linux kernel development, much less than many companies and corporation, really, almost zero, just some minor patches in the spare time when they want to, they don't like to share and contribute, they like to start from a certain type of codebase and customize everything.

If you are looking for a system widely compatible with a big portion of software and really stable, go for a Debian, Ubuntu is designed to be good looking and fatty.

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Welcome to Stack Exchange. This is a questions and answers site. Your post is just barely an answer, it mostly goes of on a tangent and is somewhat aggressive. Paragraph 1: true, and relevant, but does not answer the question on its own. Paragraph 2: strongly misleading. Paragraphs 3 and 4: an unrelated rant. If you explained why “the answer is no”, this would be an actual answer (and if you qualified it, like bahamat did, it could be a good answer — drop the anti-Ubuntu rant). – Gilles Jun 23 '12 at 0:08
This goes into the direction "Ubuntu is meant for Clients". An interesting aspect of your answer is stability. Would you classify Debian as rock-solid and secure, while Ubuntu has the newest features built in to make Laptop-users happy? – Nils Jun 23 '12 at 20:31
@Gilles - I draw very much information from this answer to my question. Although this is clearly from a pro-Debian user, it reflects some common opinions I already heard of. – Nils Jun 23 '12 at 20:33
Here I found a imho neutral WiKi that specializes on comparisons. So your main point is true - the same conclusions that you drew can be found in many places in the internet. – Nils Jun 23 '12 at 21:04
@Nils I caution you from putting too much stock in this answer. By the way, I run Debian on my home desktop computer, and I administer several Ubuntu servers. – Gilles Jun 23 '12 at 22:20
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They are not necessarily binary compatible. That being said, most packages will probably work fine. I've done this on occasion and I've never had a problem.

Although, it's not recommended to mix Debian and Ubuntu packages on a single system. If you're going to do it try to keep it at a minimum. If you're pulling in too much of the other, then perhaps you really just want the other. I'd say by the time you feel you need to add a foreign source you're probably running the wrong one.

The closer in time the freeze of the two releases (i.e., the freeze of Ubuntu LTS and Debian's release) the better compatibility you'll have.

If it's a third party package in deb format that says it's for one, it will almost certainly work on the other with few issues.

Keep in mind that this is anecdotal and just my experience. There really is no guarantee or even implication of cross-compatibility. Don't expect either the Debian or Ubuntu communities to give you much sympathy if things go wrong. In that event you're mostly on your own. As long as you're okay with that then feel free to give it a try.

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I did not ask on "Ask Ubuntu" as I suspect they do not like Debian that much... – Nils Jun 22 '12 at 21:28
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No, Debian and Ubuntu are not binary compatible. Debian and Ubuntu may use different compilers with different ABI, different kernel versions, different libraries, different packages/version etc. As not all Ubuntu packages are in Debian (and vice versa) deb packages may also depend on uninstallable versions.

RedHat and CentOS are the same as CentOS basically gets all the source packages from RedHat and compiles them. But Ubuntu does much more like providing own packages, package own Software, use older or newer versions of upstream software, fix bugs etc.

So no technically they are not binary compatible.

I may made it sound worse than it is in reality. BUT it is important to understand that the relationship between Ubuntu and Debian is NOT anything like between rhel and CentOS

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Can you explain the ABI-differences in more detail? My assumption was that they are just different distributions, based on different versions, but basically the same source-code for these versions (e.g. for a wget-package). – Nils Jun 23 '12 at 20:36
@Nils ABI-difference is not about the source code but about the architecture - e.g stackoverflow.com/questions/3784389/… this is mainly a problem for kernel modules but if ubuntu or debian decides to switch to the x32 arch this would mean that programs can not be used on the other distribution. – Ulrich Dangel Jun 23 '12 at 23:11
@nils stackoverflow.com/questions/2801938/gcc-abi-compatibility there were problems re. abi compatibility between different gcc versions but it seems this is solved. But for c++ there is no standardized name mangling though some compilers produce the same names - en.wikipedia.org/wiki/… – Ulrich Dangel Jun 23 '12 at 23:16

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