/usr/lib/x86_64-linux-gnu/libgdcmjpeg16.so is in libgdcm2-dev 2.6.3-3ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgdcmjpeg16.so.2.6
/usr/lib/x86_64-linux-gnu/libgdcmjpeg16.so.2.6