I was trying to fix it somehow as described in the link above, but the error message was still here, so I gave up.
However, because Ubuntu 14.04 has the original Intel GPU Drivers built-in (just a bit older version), there is no "unknown default OS GPU drivers" problem which could cause some problems, that a good fact, but the bad and nasty fact is, that it is just a driver, and it lack the Intel GPU Control Panel in which, the 3d options and screen ratios, and other settings can be changed. It lead to wine or Ubuntu keeping the 4:3 resolution ratio, what is a good thing on the one side (because everything in the game has proper dimensions), but is a bad thing on the other hand, because stretches 1280x1024 res down causing worse graphic quality.(the game res doesnt't cover with the LCD res). In Windows XP, In Intel GPU Panel I had set ratio to "scaling to full screen" what make 1280x1024 res in the game filling the whole LCD (my LCD is also 1280x1024) what give best graphic quality (the game running in native LCD res). So there are 2 choices:
1) Keep the ratio (real size creatures etc), but drop the LCD res and graphic quality.
2) Keep the LCD res and graphic quality, but drop the ratio (stretched creatures etc).
Windows XP SP3 give me 2 choices, Ubuntu 14.04 / or Intel, (because he dropped the support) give me 1 choice. ( 1 ).
Maybe the full res can be somehow forced on Ubuntu 14.04 without Intel GPU Control Panel, but it requires expert knowledge, burying in the system and is not friendly for the average player.
And why I did not install Ubuntu 15 which includes the newest Intel GPU drivers? Simply because I wanted to easly install Ubuntu on Windows XP, that I don't need to mess with partitions (and in case I will remove ubuntu in the future), but Ubuntu 15 doesn't allow that anymore (WUBI removed since 15 ) Check this:
I cannot not to mention about some nasty fact that after installing Ubuntu 14.04 with WUBI (from Windows XP) Ubuntu couldn't boot due to "No Bootable Device Found" Error, so I had to fix it like there:
(As much as the another nasty fact that the Ubuntu 14.04 and above has two taskbars on different sides of the screen (top and left) - I don't need 2 taskbars!)
And one of the taskbars is on the top of the screen (the taskbar), and the second one is on the left (the launcher taskbar), and it can not be (without a help of an external program) moved to another side of the screen and is attached to the left side permanently (the launcher taskbar). This is one of the reasons why Linux Mint has been created, which has only 1 taskbar and on the bottom and easly configurable - like in Windows XP/VISTA/7).
Just take a look at tthat:
This in turn reminds me of yet another nasty fact that in Google Android 2.2 on my old Samsung Galaxy smartphone I also had to install an external program (Wallpaper Wizardii) just to change the stupid wallpaper and make the wallpaper the screen size. Do you believe - a wizard and his magic was needed to change the small (but important) trifle, that should be easly changable from the OS.
As for Linux you may see that the game crash also on Linux:
And also another crashing thread on Keeper Klan Forum:
What I wanted to say at the end is that the DK2 random crashing issue is like a spike in the ass. It is just nasty. The whole game is just BETA, bugged and broken in many ways. As someone wrote earlier in a post, even the original programmers have tried to fix the random crashing problem but they could not, because they would have to rewrite a lot of code, so they simply gave up on that and abandoned the game. But it is a damn good game! Just a pity that abandoned in BETA status!