Install libnetclasses0 by entering the following commands in the terminal:
sudo apt update sudo apt install libnetclasses0
Description:
Objective-C framework for socket programming with GNUstep (libs)
Netclasses is an easy to use interface to socket programming in Objective-C with GNUstep. The core netclasses supports virtually any protocol, but the distribution comes with everything needed for TCP/IP (opening ports, background connections, etc.). Netclasses seamlessly integrates into NSRunLoop, which means there should be no need for redesigning applications to use it. . This package contains the library files.
Version: 1.06.dfsg-7build1
Section: universe/libs