/usr/lib/libgimpbase-2.0.so is in libgimp2.0-dev 2.6.12-1ubuntu1.4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libgimpbase-2.0.so.0.600.12
/usr/lib/libgimpbase-2.0.so.0.600.12