Install libstdc++6-8-dbg-riscv64-cross by entering the following commands in the terminal:
sudo apt update sudo apt install libstdc++6-8-dbg-riscv64-cross
Description:
GNU Standard C++ Library v3 (debugging files)
This package contains the shared library of libstdc++ compiled with debugging symbols. . This package contains files for riscv64 architecture, for use in cross-compile environment.
Homepage: http://gcc.gnu.org/
Version: 8-20180414-1ubuntu2cross1
Section: universe/debug