/usr/mips64el-linux-gnuabi64/lib32/libnss_files.so.2 is in libc6-mipsn32-mips64el-cross 2.27-3ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/mips64el-linux-gnuabi64/lib32/libnss_files-2.27.so