/usr/lib/x86_64-linux-gnu/sasl2/libkdexoauth2.so is in kdepim-runtime 4:17.12.3-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/sasl2/libkdexoauth2.so.3
/usr/lib/x86_64-linux-gnu/sasl2/libkdexoauth2.so.3