Linux error while loading shared libraries: cannot open shared object file: No such file or directory

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Program is part of the Xenomai test suite, cross-compiled from Linux PC into Linux+Xenomai ARM toolchain.

# echo $LD_LIBRARY_PATH                                                                                                                                          
/lib                                                                                                                                                             
# ls /lib                                                                                                                                                        
ld-2.3.3.so         libdl-2.3.3.so      libpthread-0.10.so                                                                                                       
ld-linux.so.2       libdl.so.2          libpthread.so.0                                                                                                          
libc-2.3.3.so       libgcc_s.so         libpthread_rt.so                                                                                                         
libc.so.6           libgcc_s.so.1       libstdc++.so.6                                                                                                           
libcrypt-2.3.3.so   libm-2.3.3.so       libstdc++.so.6.0.9                                                                                                       
libcrypt.so.1       libm.so.6                                                                                                                                    
# ./clocktest                                                                                                                                                    
./clocktest: error while loading shared libraries: libpthread_rt.so.1: cannot open shared object file: No such file or directory

Is the .1 at the end part of the filename? What does that mean anyway?

xenomai file-not-found shared-libraries linux
21 Answers

Update
While what I write below is true as a general answer about shared libraries, I think the most frequent cause of these sorts of message is because you've installed a package, but not installed the -dev version of that package.

Well, it's not lying - there is no libpthread_rt.so.1 in that listing. You probably need to re-configure and re-build it so that it depends on the library you have, or install whatever provides libpthread_rt.so.1.

Generally, the numbers after the .so are version numbers, and you'll often find that they are symlinks to each other, so if you have version 1.1 of libfoo.so, you'll have a real file libfoo.so.1.0, and symlinks foo.so and foo.so.1 pointing to the libfoo.so.1.0. And if you install version 1.1 without removing the other one, you'll have a libfoo.so.1.1, and libfoo.so.1 and libfoo.so will now point to the new one, but any code that requires that exact version can use the libfoo.so.1.0 file. Code that just relies on the version 1 API, but doesn't care if it's 1.0 or 1.1 will specify libfoo.so.1. As orip pointed out in the comments, this is explained well at here.

In your case, you might get away with symlinking libpthread_rt.so.1 to libpthread_rt.so. No guarantees that it won't break your code and eat your TV dinners, though.

Paul_Tomblin_33330

The linux.org reference page explains the mechanics, but doesn't explain any of the motivation behind it :-(

For that, see Sun Linker and Libraries Guide

In addition, note that "external versioning" is largely obsolete on Linux, because symbol versioning (a GNU extension) allows you to have multiple incompatible versions of the same function to be present in a single library. This extension allowed glibc to have the same external version: libc.so.6 for the last 10 years.

Employed_Russian_506170

I had this error when running my application with Eclipse CDT on Linux x86.
To fix this:

  1. In Eclipse:

    Run as -> Run configurations -> Environment

  2. Set the path

    LD_LIBRARY_PATH=/my_lib_directory_path
user_12837040

running:

sudo ldconfig

was enough to fix my issue.

user_83415180

Wanted to add, if your libraries are in a non standard path, run ldconfig followed by the path.

For instance I had to run:

sudo ldconfig /opt/intel/oneapi/mkl/2021.2.0/lib/intel64

to make R compile against Intel MKL

user_17199310

I got this error and I think its the same reason of yours

error while loading shared libraries: libnw.so: cannot open shared object file: No such file or directory

Try this. Fix permissions on files:

cd /opt/Popcorn (or wherever it is) 
chmod -R 555 * (755 if not ok)
user_28970180

I use Ubuntu 18.04

Installing the corresponding -dev package worked for me,

sudo apt install libgconf2-dev

Before installing the above package, I was getting the below error:

turtl: error while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory
user_7586730

A similar problem can be found here. I've tried the mentioned solution and it actually works.

The solutions in the previous questions may work. But the following is an easy way to fix it. It works by reinstalling the package libwbclient in fedora:

dnf reinstall libwbclient
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