I tried it on Ubuntu 12.04 with wine 1.4 and on openSuSE 12.3 with wine 1.5 and 1.7. Always segfault and "...we are sorry for this inconvenience." So am I. Any suggestions how to proceed from here?

Hi
Sorry, don't fully understand:
you mean the "Steam" client used to run the games that Valve publishes?
If yes, then you don't need to run it within Wine emulation - Steam runs natively in Linux.
(or maybe I'm totally wrong, but for the time being I cannot believe this).
Cheers

Uups, you are right, I mixed two probelms.

Yes, sorry. I mentioned the wine versions mistakenly, originally for more information. It's the 64-bit linux-client, which crashes. I later tried to start assassins creed with wine, but didn't find the executable(s) in the end.

Hi

1)
Can you please post the whole output that the steam client generates?

2)
How did you get the steam client? Did you use the official Ubuntu repositories or did you download and install it by hand?

3)
Shot in the dark - try to do this:

Well, now it is so, that after start and login steam just lists the payed for Assassin's Creed II as "Not Available".

But then I tried it with the PlayonLinux platform and I get: "The program you ran crashed. You need to enable debugging to get more details. Please go to configure menu." Debugging seems to be enabled and I get "wine: Internal errors - invalid parameters received".

Next I tried it with the PlayonLinux platform starting it in a terminal and I get: "Steam.exe has encountered a serious problem and needs to close. We are sorry for the inconvenience." Well, so am I. And why steam.exe?

And in the sorry details: "page fault on write access. Wine return 5"

I downladed it by hand for Linux x86_64.

Will try it soonest.

Tried it and renamed the blob, to no avail. Steam(?) just created a new blob.