I want to install kde on ubuntu. I type
sudo apt-get install kubuntu-desktop. But I have a error like this:
how can I fix this?
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If you are doing a fresh install and don't have any data on that machine that you want to keep, then I would look into installing Kubuntu, which is a distribution of Ubuntu, but with the KDE desktop already installed with all of it's dependencies, instead of the Gnome desktop that comes native with the standard Ubuntu distributions. http://kubuntu.org/
I ran into a similar issue a while back, and it was because I needed to install certain dependencies for that desktop. For more information about Linux desktops: http://linuxreviews.org/software/desktops/