$ sudo apt -o debug::pkgproblemresolver=1 dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) ksysguard [ amd64 ] < 4:5.3.1-0ubuntu1~ubuntu15.04~ppa1 -> 4:5.3.2-0ubuntu1~ubuntu15.04~ppa1 > ( kde )
Broken ksysguard:amd64 Depends on libksgrd5 [ amd64 ] < none -> 4:5.2.2-0ubuntu1 > ( universe/libs )
  Considering libksgrd5:amd64 1 as a solution to ksysguard:amd64 3
  Removing ksysguard:amd64 rather than change libksgrd5:amd64
Investigating (0) kubuntu-desktop [ amd64 ] < 1.323 > ( universe/metapackages )
Broken kubuntu-desktop:amd64 Depends on ksysguard [ amd64 ] < 4:5.3.1-0ubuntu1~ubuntu15.04~ppa1 -> 4:5.3.2-0ubuntu1~ubuntu15.04~ppa1 > ( kde )
  Considering ksysguard:amd64 3 as a solution to kubuntu-desktop:amd64 0
  Removing kubuntu-desktop:amd64 rather than change ksysguard:amd64
Done
Done
The following packages will be REMOVED:
  ksysguard kubuntu-desktop
The following NEW packages will be installed:
  fonts-oxygen kwin-common kwin-x11
The following packages will be upgraded:
  about-distro apt apt-transport-https apt-utils baloo-kf5 kde-cli-tools kde-cli-tools-data kde-config-gtk-style kde-config-gtk-style-preview kde-config-sddm kde-style-breeze-qt4 kdeplasma-addons-data khotkeys khotkeys-data
  kinfocenter kmenuedit kscreen ksshaskpass ksysguard-data ksysguardd kwin kwin-addons kwin-data kwrited libapt-inst1.5 libapt-pkg4.12 libkdecorations2-5 libkdecorations2private5 libkf5baloo1 libkf5balooxapian1
  libkf5filemetadata-bin libkf5filemetadata-data libkf5filemetadata3 libkf5screen6 libkf5sysguard-bin libkf5sysguard-data libkf5sysguard5 libkf5sysguard5-data libkf5waylandclient5 libkf5waylandserver5 libksgrd7
  libksignalplotter7 libkwin4-effect-builtins1 libkwineffects6 libkwinglutils6 libkwinxrenderutils6 libkworkspace5-5 libmuon libplasma-geolocation-interface5 libpowerdevilcore2 libpowerdevilui5 libprocesscore7 libprocessui7
  libtaskmanager5 libweather-ion7 milou muon-common muon-dbg muon-discover muon-notifier muon-updater plasma-dataengines-addons plasma-nm plasma-runners-addons plasma-wallpapers-addons plasma-widget-kimpanel
  plasma-widgets-addons plasma-workspace polkit-kde-1 polkit-kde-agent-1 powerdevil powerdevil-data sddm-theme-breeze systemsettings thermald ttf-oxygen-font-family
76 upgraded, 3 newly installed, 2 to remove and 0 not upgraded.
Need to get 36.4 MB of archives.
After this operation, 263 kB disk space will be freed.
Do you want to continue? [Y/n] n 
Abort.