/usr/lib/libplasmapotdprovidercore.so.1 is in plasma-dataengines-addons 4:4.14.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libplasmapotdprovidercore.so.1.0.0
/usr/lib/libplasmapotdprovidercore.so.1.0.0