I have Kubuntu 16.04 installed. My recollection is that automatic spell checking was working fine under Kubuntu 14.04, with all the misspelled words it found underlined. But now since I've upgraded, it doesn't...
Under the Configure-Kate-dialog, I have selected a bright red line for Fonts & Colors [colors tab] spelling mistake line so it should be visible. And under that dialogs Editing section, within the Spellcheck tab, I have selected [x]Automatic spell checking enable by default, to no avail. And I've tried toggling on and off this other option under the spellcheck tab [x]Automatic spell checking enabled by default, and [x]Enable auto-detection of language, to no avail.
Outside of the configure-kate-dialog, under the main menu's TOOLS>spelling> [x]automatic spell checking has been toggled on and off, to no avail. Any ideas what's going on?
apt-cache policy aspell:
aspell: Installed: 0.60.7~20110707-3build1 Candidate: 0.60.7~20110707-3build1 Version table: *** 0.60.7~20110707-3build1 500 500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64