How do I reinstall kde?

[Pierre Abbat]

I just upgraded kernel and world and packages. It told me it's removing a 
bunch of packages. One of them is Postfix; two people told me on IRC that it's 
because of OpenSSL and I should reinstall Postfix, so I did. Several others are 
py37-foo, which was replaced with py38-foo. Two others are openldap-client and 
ilmbase; I don't know what uses them. That leaves kde5, plasma5-plasma, and 
plasma5-plasma-desktop. Which package should I install to get a KDE desktop?

Pierre
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