Instalei o KDE Plasma 5.6 no Ubuntu 16.04 e tudo funcionou bem.
Alguns dias atrás eu tentei instalar uma nova versão do KDE Plasma (eu tentei o ppa de teste mencionado aqui e outras tentativas) e de alguma forma eu quebrei o meu KDE.
Agora eu gostaria de reinstalar o KDE Plasma 5.6, então tentei primeiro remover todos os traços do KDE e instalá-lo novamente, basicamente seguindo os comandos usados no passado:
$ sudo add-apt-repository ppa:kubuntu-ppa/backports
$ sudo apt-get update
$ sudo apt-get dist-upgrade
$ sudo apt-get install kubuntu-desktop
mas agora recebo este erro:
The following packages have unmet dependencies:
kubuntu-desktop : Depends: breeze but it is not going to be installed
Depends: dolphin but it is not going to be installed
Depends: kde-cli-tools but it is not going to be installed
Depends: khelpcenter but it is not going to be installed
Depends: kinfocenter but it is not going to be installed
Depends: kwin
Depends: plasma-desktop but it is not going to be installed
Depends: sddm-theme-breeze 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: apturl-kde but it is not going to be installed
Recommends: bluedevil but it is not going to be installed
Recommends: kaddressbook but it is not going to be installed
Recommends: kate but it is not going to be installed
Recommends: kde-config-sddm but it is not going to be installed
Recommends: kde-telepathy but it is not going to be installed
Recommends: kdeconnect-plasma but it is not going to be installed
Recommends: kmail 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: kscreen but it is not going to be installed
Recommends: kwin-addons but it is not going to be installed
Recommends: milou but it is not going to be installed
Recommends: plasma-dataengines-addons but it is not going to be installed
Recommends: plasma-discover but it is not going to be installed
Recommends: plasma-nm but it is not going to be installed
Recommends: plasma-pa but it is not going to be installed
Recommends: plasma-runners-addons but it is not going to be installed
Recommends: plasma-wallpapers-addons but it is not going to be installed
Recommends: plasma-widgets-addons but it is not going to be installed
Recommends: print-manager but it is not going to be installed
O que posso fazer? Muito obrigado Vincenzo