I was wondering, when I update things I often get messages that say:

and messages such as those. Why do I get them? It appears not to matter as everything completes successfully. 

-- 

Unpacking virtualbox-guest-dkms (4.3.34-dfsg-1+deb8u1ubuntu1.14.04.1) over (4.3.18-dfsg-1~ubuntu1~trusty1) ...

Preparing to unpack .../archives/inxi_1.9.17-1_all.deb ...

Unpacking inxi (1.9.17-1) over (1.8.4-1) ...

Processing triggers for man-db (2.6.7.1-1ubuntu1) ...

Processing triggers for ureadahead (0.100.0-16) ...

ureadahead will be reprofiled on next reboot

Processing triggers for cups (1.7.2-0ubuntu1.6) ...

Processing triggers for hicolor-icon-theme (0.13-1) ...

Processing triggers for shared-mime-info (1.2-0ubuntu3) ...

Unknown media type in type 'all/all'

Unknown media type in type 'all/allfiles'

Unknown media type in type 'uri/mms'

Unknown media type in type 'uri/mmst'

Unknown media type in type 'uri/mmsu'

Unknown media type in type 'uri/pnm'

Unknown media type in type 'uri/rtspt'

Unknown media type in type 'uri/rtspu'

Processing triggers for mime-support (3.54ubuntu1.1) ...

Processing triggers for desktop-file-utils (0.22-1ubuntu1) ...

Setting up libssl1.0.0:i386 (1.0.1f-1ubuntu2.16) ...

Setting up libssl1.0.0:amd64 (1.0.1f-1ubuntu2.16) ...

Setting up libcupsfilters1:amd64 (1.0.52-0ubuntu1.6) ...

Setting up libfontembed1:amd64 (1.0.52-0ubuntu1.6) ...

Setting up libsndfile1:amd64 (1.0.25-7ubuntu2.1) ...

Setting up libsndfile1:i386 (1.0.25-7ubuntu2.1) ...

Setting up openssl (1.0.1f-1ubuntu2.16) ...

Setting up cups-browsed (1.0.52-0ubuntu1.6) ...

cups-browsed start/running, process 31502

Setting up cups-filters-core-drivers (1.0.52-0ubuntu1.6) ...

Setting up cups-filters (1.0.52-0ubuntu1.6) ...

.

Setting up virtualbox-dkms (4.3.34-dfsg-1+deb8u1ubuntu1.14.04.1) ...

Loading new virtualbox-4.3.34 DKMS files...

Building only for 3.13.0-37-generic

Building initial module for 3.13.0-37-generic

Done.