/usr/lib/libitkv3p_lsqr-4.5.so is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libitkv3p_lsqr-4.5.so.1
/usr/lib/libitkv3p_lsqr-4.5.so.1