I have 3 machines that _should_ be nearly idnetical. On 2 of them, i have no issues installing an extension I copiled. On one I get the followign error message: icadb=# CREATE EXTENSION IF NOT EXISTS pg_libphonenumber; ERROR: could not load library "/usr/lib/postgresql/11/lib/pg_libphonenumber.so": libphonenumber.so.7: cannot open shared object file: No such file or directory icadb=# ls -l /usr/lib/postgresql/11/lib/pg_libphonenumber.so Yet, root@ica-db:/home/stan/BUILD/pg-libphonenumber-master# ls -l /usr/lib/postgresql/11/lib/pg_libphonenumber.so -rwxr-xr-x 1 root root 182976 Oct 22 16:11 /usr/lib/postgresql/11/lib/pg_libphonenumber.so This appears to be identical to the other machines where this works, root@smokey:/home/stan/BUILD/pg-libphonenumber-master# logout stan@smokey:~/BUILD/pg-libphonenumber-master$ ls -l /usr/lib/postgresql/11/lib/pg_libphonenumber.so -rwxr-xr-x 1 root root 182976 Oct 22 09:47 /usr/lib/postgresql/11/lib/pg_libphonenumber.so What else could be wrong? -- "They that would give up essential liberty for temporary safety deserve neither liberty nor safety." -- Benjamin Franklin