Install libobjc4-dbg-alpha-cross by entering the following commands in the terminal:
sudo apt update sudo apt install libobjc4-dbg-alpha-cross
Description:
Runtime library for GNU Objective-C applications (debug symbols)
Library needed for GNU ObjC applications linked against the shared library.
Homepage: http://gcc.gnu.org/
Version: 8-20180414-1ubuntu2cross1
Section: universe/debug