I know I have the library, but the executable can't find it. If I knew where it was searching, I could just create a symlink where it expects to find the lib.

$ ~/Apps/simutrans/simutrans
/home/dan/Apps/simutrans/simutrans: error while loading shared libraries: libbz2.so.1.0: cannot open shared object file: No such file or directory

$ locate libbz2

Apparently, the executable isn't using /etc/ld.so.conf* to find libraries; if it was, then it would have found the lib:

$ cat /etc/ld.so.conf.d/x86_64-linux-gnu.conf 
# Multiarch support

Inspecting the executable with readelf, as mentioned in where will the system search for dynamic libraries?, doesn't show a RUNPATH entry that would have shown when the library needs to be found.


Assuming your program runs with the current user (no setuid, etc), you can use strace to get this information, e.g.,

strace -o foo.out ~/Apps/simutrans/simutrans

and look in the output file for open calls.

  • Found it, created a symlink, and now the executable crashes with /home/dan/Apps/simutrans/simutrans: error while loading shared libraries: libbz2.so.1.0: wrong ELF class: ELFCLASS64. Looks like I got handed a 32 bit version. – Dan Ross Dec 12 '15 at 12:58

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