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A Linux user's nightmare: the machine was wiped clean with one click
(www.mikrobitti.fi)
This is a most excellent place for technology news and articles.
Original report, in English:
https://old.reddit.com/r/kde/comments/1bixmbx/do_not_install_global_themes_some_wipe_out_all/
It's possible that this deletion was a shell script mistake rather than malice, but it really shouldn't be allowed either way. It's made even worse by the UI that encourages users to install themes that that could have been made by anyone, with practically no oversight, and with no warning that they can execute arbitrary code.
I like KDE for a lot of reasons, but I'm ashamed of them for this irresponsible blunder.
Let's hope they respond by closing this hole and any others like it. If they have to break compatibility with existing themes, now seems like a good time for it, since Plasma 6 was only just released.