Comment # 4 on bug 1231346 from David Kerkhof

(In reply to Jan Engelhardt from comment #1)
> Cannot reproduce.
> 
> libpthread.so is not supposed to be in /usr/lib/virtualbox.
> There is but one reason why VBoxSVC might search for a .so file in
> /usr/lib/virtualbox: There was no "libpthread.so" in any system path that
> matched the current architecture. But this is to be expected, too, because..
> 
> 1. libpthread.so is a hint file and for software development scenarios only.
> Its presence is *not guaranteed* on normal systems. *No program* should ever
> attempt to dlopen "libpthread.so", but *must* use "libpthread.so.0".
> 
> 2. glibc>=2.34 (or thereabouts) has abolished the libpthread.so hint file
> altogether.
> 
> (The same goes for libdl.)

I know it's a hack which is not supposed to be needed, but as soon as I remove
the mentioned symlinks the vm's fail to start, I copy them back in place and it
works again. But to fix it in the correct way is not my expertise so that's why
I wrote it here, maybe the underlying cause can be found.