001. Question

root@ubuntu01:/home/software/PopIns2/PopIns2# ./ popins2 
. / popins2 : error while loading shared libraries: libbifrost.so: cannot open shared object file: No such file or directory

002, the cause of the problem

Analysis of the reason: ld prompts that the library file cannot be found, and the library file is in the current directory.

The default directories of the linker ld are /lib and /usr/lib. If they are placed in other paths, you need to let ld know where the library files are.

003. Find the file

root@ubuntu01:/home/software/PopIns2/PopIns2# find / -name " libbifrost.so "
 /usr/local/lib/ libbifrost.so
 /home/software/bifrost/build/src/ libbifrost.so 
find: ' / run /user/ 1000 / doc': Permission denied
find: ' /run/user/ 1000 / gvfs': Permission denied
find: ' /run/user/ 127 / doc': Permission denied
find: ' /run/user/ 127 /gvfs': Permission denied

004. Solution

method 1:

Edit the /etc/ld.so.conf file and add the directory where the library file is located in a new line;

Run ldconfig to update the /etc/ld.so.cache file;
method 2:

Create any file with a .conf suffix in the /etc/ld.so.conf.d/ directory, and add the directory where the library file is located in the file;

Run ldconfig to update the /etc/ld.so.cache file;

I think the second method is more convenient, with minimal changes to the original system. Because the content of the /etc/ld.so.conf file is include /etc/ld.so.conf.d/*.conf

root@ubuntu01:/home/software/PopIns2/PopIns2# echo " /home/software/bifrost/build/src/libbifrost.so " > /etc/ld.so.conf.d/bifrost.so 
root@ubuntu01 : / home/software/PopIns2/PopIns2# ldconfig ## Update library files

005. Test

root@ubuntu01:/home/software/PopIns2/PopIns2# ./popins2

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