IDL package needs libxp

sudo apt-get install libxp6
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
gstreamer0.10-plugins-base lammps-daily-doc libcdaudio1 libdirectfb-1.2-9
libgstreamer-plugins-base0.10-0 libgstreamer0.10-0 libmpcdec6 libslv2-9
linux-image-4.2.0-35-generic linux-image-extra-4.2.0-35-generic
linux-signed-image-4.2.0-35-generic
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed:
libxp6
0 to upgrade, 1 to newly install, 0 to remove and 69 not to upgrade.
Need to get 22.2 kB of archives.
After this operation, 77.8 kB of additional disk space will be used.
WARNING: The following packages caot be authenticated!
libxp6
Install these packages without verification? [y/N] y
Get:1 http://ftp.de.debian.org/debian jessie/main amd64 libxp6 amd64 1:1.0.2-2 [22.2 kB]
Fetched 22.2 kB in 1s (17.5 kB/s)
Selecting previously unselected package libxp6:amd64.
(Reading database ... 230293 files and directories currently installed.)
Preparing to unpack .../libxp6_1%3a1.0.2-2_amd64.deb ...
Unpacking libxp6:amd64 (1:1.0.2-2) ...
Setting up libxp6:amd64 (1:1.0.2-2) ...
Processing triggers for libc-bin (2.23-0ubuntu3) ...