[Bug 38994] Re: kicker applet 'arythmetic evaluator' has problem with national decimal symbol

[magic-]

I had the same problem and finally found out that it was a problem of different locale settings in kde and basic settings.
While I had changed the number format in KDE to use decimal points, the locale number format LC_NUMBER was still "de_DE.UTF-8. Adding the line

LC_NUMERIC="en_US.UTF-8"

to /etc/default/locale fixed the problem.

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kicker applet 'arythmetic evaluator' has problem with national decimal symbol
https://launchpad.net/bugs/38994