I'm trying install firebird 2.5.x x86 on debian 10/ubuntu 18. When run install, I got

Extracting install data
Please enter new password for SYSDBA user: masterkey
./scripts/postinstall.sh: 114: ./scripts/postinstall.sh: /opt/firebird/bin/gsec: not found

ls -la  /opt/firebird/bin/gsec
-rwxr-xr-x 1 root root 297716 lut 14  2017 /opt/firebird/bin/gsec

What can I do to fix it?