The last system upgrade makes some changes in the system so be careful.
It wants to remove some packages:
Packages to be removed:
audacity avidemux avidemux-plugins avidemux-qt browser-plugin-vlc dvd95
gnome-control-center gstreamer0.10-plugins-ugly gstreamer1.0-plugins-bad
gstreamer1.0-plugins-ugly kadu libasound2-plugins:i386 libcheese-gtk23
libcheese7 libopencv-calib3d2.4 libopencv-contrib2.4 libopencv-features2d2.4
libopencv-highgui2.4 libopencv-legacy2.4 libopencv-objdetect2.4 mencoder
minitube ogmrip phonon phonon-backend-vlc skype:i386 twolame vlc vlc-nox
New packages to be installed:
libavresample-ffmpeg2 libavresample-ffmpeg2:i386 libavutil-ffmpeg54
libavutil-ffmpeg54:i386 libswresample-ffmpeg1 libswscale-ffmpeg3
Hold packages:
Packages to be upgraded:
libopencv-core2.4 libopencv-flann2.4 libopencv-imgproc2.4 libopencv-ml2.4

To fix that, remove ‘libasound2-plugins’ package before upgrading.
sudo apt-get remove libasound2-plugins
sudo apt-get autoremove

If you have ‘libasound2-plugins:i386’ package installed on 64bit system – remove it too.
sudo apt-get remove libasound2-plugins:i386
sudo apt-get autoremove

Then perform standard full upgrade:
sudo apt-get update
sudo apt-get dist-upgrade

The operations can remove ‘pulseaudio’, ‘pavucontrol’ and ‘skype’ packages so install them back after.

Looks like ‘skype’ can’t be installed back – it depends on ‘libasound2-plugins’ which can’t be installed – broken dependencies.