/usr/lib/x86_64-linux-gnu/libkmindexreader.so.5 is in kdepim-runtime 4:16.04.2-2+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libkmindexreader.so.5.2.2
/usr/lib/x86_64-linux-gnu/libkmindexreader.so.5.2.2