According to this bug http://bugs.kde.org/show_bug.cgi?id=124866 the
option is available in the edit menu on SuSE, but on kubuntu it is
grayed out.
** Changed in: meta-kde (Ubuntu)
Sourcepackagename: meta-kde => kdebase
Status: Unconfirmed => Confirmed
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Cannot remove "network folder"
https://launchpad.net/bugs/59697