/usr/lib/libwx_gtk2ud_plot-2.6.so.0 is in libwxgtk2.6-dbg 2.6.3.2.2-5ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libwx_gtk2ud_plot-2.6.so.0.3.1
/usr/lib/libwx_gtk2ud_plot-2.6.so.0.3.1