ubuntu-15.04-desktop-amd64想要安装KDE桌面，结果出现以下问题

The following packages have unmet dependencies:
 kubuntu-desktop : Depends: ark but it is not going to be installed
                   Depends: audiocd-kio but it is not going to be installed
                   Depends: dolphin but it is not going to be installed
                   Depends: gstreamer0.10-qapt but it is not going to be installed
                   Depends: kde-window-manager but it is not going to be installed
                   Depends: kde-workspace but it is not going to be installed
                   Depends: kdepasswd but it is not going to be installed
                   Depends: khelpcenter4 but it is not going to be installed
                   Depends: klipper but it is not going to be installed
                   Depends: kmix but it is not going to be installed
                   Depends: konsole but it is not going to be installed
                   Depends: ksnapshot but it is not going to be installed
                   Depends: ksysguard but it is not going to be installed
                   Depends: lightdm-kde-greeter but it is not going to be installed
                   Depends: okular but it is not going to be installed
                   Depends: plasma-desktop but it is not going to be installed
                   Depends: plasma-netbook but it is not going to be installed
                   Depends: software-properties-kde but it is not going to be installed
                   Depends: systemsettings but it is not going to be installed
                   Recommends: akregator but it is not going to be installed
                   Recommends: amarok but it is not going to be installed
                   Recommends: apport-kde but it is not going to be installed
                   Recommends: apturl-kde but it is not going to be installed
                   Recommends: bluedevil but it is not going to be installed
                   Recommends: colord-kde but it is not going to be installed
                   Recommends: dragonplayer but it is not going to be installed
                   Recommends: gwenview but it is not going to be installed
                   Recommends: k3b but it is not going to be installed
                   Recommends: kaccessible but it is not going to be installed
                   Recommends: kaddressbook but it is not going to be installed
                   Recommends: kamera but it is not going to be installed
                   Recommends: kate but it is not going to be installed
                   Recommends: kcalc but it is not going to be installed
                   Recommends: kde-baseapps-bin but it is not going to be installed
                   Recommends: kde-telepathy but it is not going to be installed
                   Recommends: kdepim-kresources but it is not going to be installed
                   Recommends: kdepim-runtime but it is not going to be installed
                   Recommends: kdesudo but it is not going to be installed
                   Recommends: kmag but it is not going to be installed
                   Recommends: kmail but it is not going to be installed
                   Recommends: kmousetool but it is not going to be installed
                   Recommends: knotes but it is not going to be installed
                   Recommends: kontact but it is not going to be installed
                   Recommends: korganizer but it is not going to be installed
                   Recommends: krdc but it is not going to be installed
                   Recommends: kscreen but it is not going to be installed
                   Recommends: ksystemlog but it is not going to be installed
                   Recommends: ktorrent but it is not going to be installed
                   Recommends: kubuntu-docs but it is not going to be installed
                   Recommends: kubuntu-notification-helper but it is not going to be installed
                   Recommends: kwalletmanager but it is not going to be installed
                   Recommends: libreoffice-base but it is not going to be installed
                   Recommends: libreoffice-kde but it is not going to be installed
                   Recommends: libreoffice-style-oxygen but it is not going to be installed
                   Recommends: muon-discover but it is not going to be installed
                   Recommends: muon-notifier but it is not going to be installed
                   Recommends: partitionmanager but it is not going to be installed
                   Recommends: plasma-nm but it is not going to be installed
                   Recommends: plasma-runner-telepathy-contact but it is not going to be installed
                   Recommends: plasma-widgets-addons but it is not going to be installed
                   Recommends: polkit-kde-1 but it is not going to be installed
                   Recommends: print-manager but it is not going to be installed
                   Recommends: qapt-deb-installer but it is not going to be installed
                   Recommends: quassel but it is not going to be installed
                   Recommends: skanlite but it is not going to be installed
                   Recommends: ttf-punjabi-fonts but it is not going to be installed
                   Recommends: usb-creator-kde but it is not going to be installed
                   Recommends: user-manager but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

 

有一些软件包没法被安装。若是您用的是 unstable 发行版，这也许是

由于系统没法达到您要求的状态形成的。该版本中可能会有一些您须要的软件

包还没有被建立或是它们已被重新到(Incoming)目录移出。

下列信息可能会对解决问题有所帮助：

 

下列软件包有未知足的依赖关系：

 kubuntu-desktop : 依赖: ark 可是它将不会被安装

                   依赖: dolphin 可是它将不会被安装

                   依赖: kde-window-manager

                   依赖: kde-workspace-bin 可是它将不会被安装

                   依赖: kdemultimedia-kio-plugins 可是它将不会被安装

                   依赖: kdepasswd 可是它将不会被安装

                   依赖: kdm 可是它将不会被安装

                   依赖: khelpcenter4 可是它将不会被安装

                   依赖: klipper 可是它将不会被安装

                   依赖: konsole 可是它将不会被安装

                   依赖: ksnapshot 可是它将不会被安装

                   依赖: ksysguard 可是它将不会被安装

                   依赖: language-selector-kde 可是它将不会被安装

                   依赖: okular 可是它将不会被安装

                   依赖: plasma-desktop 可是它将不会被安装

                   依赖: plasma-netbook 可是它将不会被安装

                   依赖: software-properties-kde 可是它将不会被安装

                   依赖: systemsettings 可是它将不会被安装

                   推荐: akregator 可是它将不会被安装

                   推荐: amarok 可是它将不会被安装

                   推荐: apport-kde 可是它将不会被安装

                   推荐: apturl-kde 可是它将不会被安装

                   推荐: bluedevil 可是它将不会被安装

                   推荐: dragonplayer 可是它将不会被安装

                   推荐: gstreamer0.10-qapt 可是它将不会被安装

                   推荐: gwenview 可是它将不会被安装

                   推荐: jockey-kde 可是它将不会被安装

                   推荐: k3b 可是它将不会被安装

                   推荐: kaccessible 可是它将不会被安装

                   推荐: kaddressbook 可是它将不会被安装

                   推荐: kamera 可是它将不会被安装

                   推荐: kate 可是它将不会被安装

                   推荐: kcalc 可是它将不会被安装

                   推荐: kde-config-touchpad 可是它将不会被安装

                   推荐: kdepim-kresources 可是它将不会被安装

                   推荐: kdepim-runtime 可是它将不会被安装

                   推荐: kdepim-strigi-plugins 可是它将不会被安装

                   推荐: kdesudo 可是它将不会被安装

                   推荐: kmag 可是它将不会被安装

                   推荐: kmail 可是它将不会被安装

                   推荐: kmousetool 可是它将不会被安装

                   推荐: knotes 可是它将不会被安装

                   推荐: kontact 可是它将不会被安装

                   推荐: kopete 可是它将不会被安装

                   推荐: korganizer 可是它将不会被安装

                   推荐: kpat 可是它将不会被安装

                   推荐: kppp 可是它将不会被安装

                   推荐: ksystemlog 可是它将不会被安装

                   推荐: ktimetracker 可是它将不会被安装

                   推荐: ktorrent 可是它将不会被安装

                   推荐: kubuntu-firefox-installer 可是它将不会被安装

                   推荐: kubuntu-notification-helper 可是它将不会被安装

                   推荐: kvkbd 可是它将不会被安装

                   推荐: kwalletmanager 可是它将不会被安装

                   推荐: libreoffice-kde 可是它将不会被安装

                   推荐: muon 可是它将不会被安装

                   推荐: muon-installer 可是它将不会被安装

                   推荐: muon-notifier 可是它将不会被安装

                   推荐: partitionmanager 可是它将不会被安装

                   推荐: plasma-widget-facebook 可是它将不会被安装

                   推荐: plasma-widget-networkmanagement 可是它将不会被安装

                   推荐: plasma-widgets-addons 可是它将不会被安装

                   推荐: polkit-kde-1 可是它将不会被安装

                   推荐: printer-applet 可是它将不会被安装

                   推荐: qapt-deb-installer 可是它将不会被安装

                   推荐: quassel 可是它将不会被安装

                   推荐: rekonq 可是它将不会被安装

                   推荐: system-config-printer-kde 可是它将不会被安装

                   推荐: usb-creator-kde 可是它将不会被安装

                   推荐: userconfig 可是它将不会被安装

E: 没法修正错误，由于您要求某些软件包保持现状，就是它们破坏了软件包间的依赖关系。