/nginx: error while loading shared libraries: libluajit-5.1.so.2: cannot open shared object file: No such file or directory

This error message indicates that the libluajit-5.1.so.2 library file is missing or cannot be found in the system library path.

To resolve this issue, you can try the following steps:

1. Check if the library file exists on your system by running the following command:

   find / -name "libluajit-5.1.so.2"

This will search for the library file in all directories starting from the root directory.

2. If the library file is found, you can add its directory to the system library path by running the following command:

   export LD_LIBRARY_PATH=/path/to/library/directory:$LD_LIBRARY_PATH

Replace "/path/to/library/directory" with the actual directory path where the library file is located.

3. If the library file is not found, you can install it by running the following command:

   sudo apt-get install libluajit-5.1-2

This will install the libluajit-5.1-2 package which contains the library file.

4. Once the library file is installed or added to the system library path, you can try running the nginx command again.