Enable 256 colors in Konsole (Kubuntu)

Question

I would like to enable 256 colors in Konsole but I didn't get it working the right way. I have set in my enviroment:

TERM=xterm-256color

$ tput colors
256

But the colortest of base16 always prints colors 17-21 in blue.

What am I missing to get 256 colors working?

Answer 1

These extra colors swatch can't currently be set, as described in this Konsole bug report: https://bugs.kde.org/show_bug.cgi?id=344181