lib64stdc++6-8-dbg-mipsr6el-cross 8.3.0-26ubuntu1cross3ubuntu3 (amd64 binary) in ubuntu focal

 This package contains a debug build of the shared libstdc++ library. The debug
 symbols for the default build can be found in the libstdc++6-dbgsym package.
 .
 This package contains files for mipsr6el architecture, for use in cross-compile
 environment.