我正在使用 Ubuntu 15.10，我想安装 Plasma 5.4。我执行了以下步骤：
sudo add-apt-repository ppa:kubuntu-ppa/backports sudo apt-get update && sudo apt-get dist-upgrade
正如我正在使用统一Ubuntu 版本，我尝试安装Kubuntu 桌面包：
sudo apt-get install kubuntu-desktop
但我遇到了以下依赖问题：
The following packages have unmet dependencies: kubuntu-desktop:Depends:software-properties-kde 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: kubuntu-driver-manager but it is not going to be installed Recommends: kubuntu-notification-helper 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 E: Unable to correct problems, you have held broken packages.
我尝试通过逐个安装这些软件包来处理依赖关系：
apt-get -s install software-properties-kde
但它给出了另一个依赖错误，python3-pyqt5而这又导致了另一个依赖错误qtbase-abi-5-4-2。