The version I showed in my previous post was one I compiled from your 
sources.
 I did that because the official version (I have tried several of the older 
versions also) 
gave the same problem.

I have removed an attempted solution (export 
LD_PRELOAD=/usr/lib/libdlfaker.so) from my shell startup file
 which proved to make the situation worse. 

Now I can work despite some error messages from time to time.

Regards.
Johann
On Monday, 23 April 2018 17:40:03 UTC+2, DRC wrote:
>
> optirun/Bumblebee is not maintained or supported by us.  Can you 
> reproduce this problem with our official VirtualGL packages: 
> https://sourceforge.net/projects/virtualgl/files/2.5.2/ 
> ? <https://sourceforge.net/projects/virtualgl/files/2.5.2/?>? 
>
> Unfortunately O/S distributors sometimes package VirtualGL incorrectly, 
> in ways that cause certain applications to break (particularly when 
> those applications try to use dlopen() to load libGL.)  This is often a 
> result of trying to shoehorn VirtualGL into particular system 
> requirements for DSOs without fundamentally understanding that VirtualGL 
> is an interposer and thus needs to be excepted from those requirements 
> in order to avoid breakage. 
>
> The fact that libvglfaker.so and libvglfaker-nodl.so are exactly the 
> same size on your system makes me immediately suspicious that you're 
> using an O/S-supplied or downstream VirtualGL package that was packaged 
> incorrectly.  Please try again with our official DEB packages.  If you 
> are still having problems with those packages, then we can go from there. 
>
> Also, I assume that you have installed the same version of the nVidia 
> proprietary drivers on both computers and that everything else is mostly 
> the same between the two of them. 
>
> DRC 
>
> On 4/23/18 7:38 AM, Johann wrote: 
> > I have installed virtualgl (2.5.2) on Debian on two laptops to work with 
> > bumblebee and NVIDIA Graphics cards. 
> > 
> > On the older laptop there is no problem. On the newer one I get the 
> > error message in the subject line when I run any command that involves 
> > some gui-based executable. I have to run "optirun <command>"  to get 
> > around this.  This is not sustainable. 
> > 
> > In /usr/lib: 
> > 
> > -rw-r--r-- 1 root root 643544 Apr 23 10:07 libvglfaker.so 
> > -rw-r--r-- 1 root root 643544 Apr 23 10:07 libvglfaker-nodl.so 
> > 
> > Also, while I can run Darktable with the opengl option on the first 
> > computer, it tells me on the second one that that option is not 
> > available although I run it through optirun or vglrun|.| 
> > 
> > How do I solve this problem? 
> > 
> > Regards 
> > Johann 
>

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