The application is wrong. It should look for libfbclient.so.2 and nothing else.
The libfbclient library from the 2.5 branch is perfectly compatible with 2.1. See also https://answers.launchpad.net/ubuntu/+source/firebird2.1/+question/171341 ** Changed in: firebird2.1 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/696199 Title: libfbclient2 dependency problems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firebird2.1/+bug/696199/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs