/usr/mipsisa64r6-linux-gnuabin32/lib64/libm.so.6 is in libc6-mips64-mipsn32r6-cross 2.27-3ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/mipsisa64r6-linux-gnuabin32/lib64/libm-2.27.so