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Showing developer posts only. Show all posts in this thread.
About this issue:

First I must admit that I'm not very LINUX savy myself so I might misunderstand some things. But sadly it seems that this problem has the simple explanation that your LINUX version (or what do you say? Build? Depot?) is not supported.

Quote from the LINUX system requirements listed on Steam:
OS: Ubuntu 12.04 LTS

It is probably possible to make it work also on other systems. But sadly it's nothing we can guarantee or help with (unless some developer decides to jump in on his/her own initiative). Sorry :/
 
Just a couple minor things :p
* 'Linux' isn't an acronym; typically people just spell it 'Linux'. Some people like to say "GNU/Linux", since technically 'Linux' is just the kernel. 'UNIX', however, does need to be capitalized.
* We usually call different 'versions' of Linux as 'distributions' or 'distros'.

Some longer things:
* Ubuntu is based on Debian. Although Debian, Arch, etc use a lot of the same software, there are some fundamental design differences. Most of these are pretty low-level though. Both Debian and Arch are considered to be fairly minimalist (especially the latter). Ubuntu, which is based on Debian's packages, is also designed quite a bit differently from it, and comes pre-installed with a lot of software, aiming to be "user-friendly". In fact, Ubuntu is so different from Debian nowadays that several Ubuntu packages won't work on Debian anymore, even though they both use .deb. Mint is basically an even more user-friendly Ubuntu (it also comes in a Debian flavor). Fedora and CentOS are basically free versions of Red Hat Enterprise Linux. OpenSUSE was originally Slackware based, but is now its own standalone thing. Gentoo is mostly insane, but I respect it; users must compile all software from source code on it.
* Arch Linux has comparatively fewer users than most of the others (it's steadily increasing though!). However, since there are no known reports of problems from other distros, we can't assume it to be a problem resulting just from Arch not being Debian-based. Fedora, OpenSUSE, etc all use repackaged versions of Steam as well. We also don't even know if this issue affects all Arch users.
* CK2 runs flawlessly on Arch, with the exception of major DLC. The game works ~ the DLC mechanism is just a little bugged. It's a great game, too. :)

The DLC's apparently may have worked on Arch in the past, so it may be a regression in a newer version. One person (Agustina) reported version ~1.10 as having worked for them. I say "may have worked" because we don't know what distro that person was using. I'm going to see if I can get a copy of that version from Youcke to test it out.
All of my other Steam games run flawlessly on Arch, so I'm sure there's a solution around here somewhere. Indeed, as I mentioned, CK2 runs flawlessly apart from major DLC's. Heck, I can even run a lot of Windows software in Arch without problems.

You learn something every day :)

I will try to steer the attention of the correct people to this thread to see if any further assistance can be arranged.
 
It shouldń be too hard too fix, I think

We have virtually no time for Linux testing though. This is a problem that will require some testing on different distros to figure out, which is exactly why we don't support more than one dist and even one version of the dist. I'm sorry, but I can't really promise you that we are going to fix it. I'll link our Linux guy (who is also a Windows guy) to the thread, but he is swamped as it is. If you run out of patience, please have the support help you get a refund.