How to fix "no backend found for spell checking" in Kate editor settings?
I have installed Kate editor into my Ubuntu MATE 16.04.6 LTS system as simple assudo apt-get install kate .
In its Settings → Configure Kate, Editor Component, Editing, Spellcheck tab I see that it does not detect back-end for spell-checking:
No backend found for spell checking
$ kate Sonnet: No speller backends available! No language dictionaries for the language: "en"
I have the following packages installed related to spell-check:
$ dpkg -l | grep -iE "dict|spell.*(check|correct)"
ii anthy 9100h-25ubuntu1 amd64 input method for Japanese - backend, dictionary and utility
ii anthy-common 9100h-25ubuntu1 all input method for Japanese - common files and dictionary
ii aspell 0.60.7~20110707-3build1 amd64 GNU Aspell spell-checker
ii aspell-en 7.1-0-1.1 all English dictionary for GNU Aspell
ii dictionaries-common 1.26.3 all spelling dictionaries - common utilities
ii enchant 1.6.0-10.1build2 amd64 Wrapper for various spell checker engines (binary programs)
ii geany-plugin-spellcheck 1.27+dfsg-2 amd64 spellcheck plugin for Geany
ii hunspell-en-ca 1:5.1.0-1ubuntu2.2 all English (Canada) dictionary for hunspell
ii hunspell-en-gb 1:5.1.0-1ubuntu2.2 all English (GB) dictionary for hunspell
ii hunspell-en-us 20070829-6ubuntu3 all English_american dictionary for hunspell
ii hunspell-en-za 1:5.1.0-1ubuntu2.2 all English (South Africa) dictionary for hunspell
ii hunspell-ru 20120501-1 all Russian dictionary for hunspell
ii iamerican 3.4.00-5 all American English dictionary for ispell (standard version)
ii ienglish-common 3.4.00-5 all Common files for British and American ispell dictionaries
ii ispell 3.4.00-5 amd64 International Ispell (an interactive spelling corrector)
ii libaspell15:amd64 0.60.7~20110707-3build1 amd64 GNU Aspell spell-checker runtime library
ii libenchant1c2a:amd64 1.6.0-10.1build2 amd64 Wrapper library for various spell checker engines (runtime libs)
ii libgdict-common 3.18.0-2 all GNOME Dictionary base library - common files
ii libgtkspell0 2.0.16-1.1ubuntu1 amd64 a spell-checking addon for GTK's TextView widget
ii libgtkspell3-3-0:amd64 3.0.7-2 amd64 spell-checking addon for GTK+'s TextView widget
ii libhunspell-1.3-0:amd64 1.3.3-4ubuntu1 amd64 spell checker and morphological analyzer (shared library)
ii libhunspell-dev:amd64 1.3.3-4ubuntu1 amd64 spell checker and morphological analyzer (development)
ii libjazzy-java 0.5.2-1 all spell checker java library
ii libkf5sonnet5-data 5.18.0-0ubuntu1 all spell checking library for Qt
ii libkf5sonnetcore5:amd64 5.18.0-0ubuntu1 amd64 spell checking library for Qt
ii libkf5sonnetui5:amd64 5.18.0-0ubuntu1 amd64 spell checking library for Qt
ii libmatedict6 1.12.0-1 amd64 MATE desktop utilities (matedict library)
ii link-grammar-dictionaries-en 4.7.4-3 all Carnegie Mellon University's link grammar parser (English dictionary)
ii myspell-en-au 2.1-5.4 all English_australian dictionary for myspell
ii myspell-en-gb 1:5.1.0-1ubuntu2.2 all English (GB) dictionary for hunspell - dummy transitional package
ii myspell-en-za 1:5.1.0-1ubuntu2.2 all English (ZA) dictionary for hunspell - dummy transitional package
rc myspell-ru 0.99g5-20 all Russian dictionary for MySpell
ii python-enchant 1.6.6-2 all spellchecking library for Python
ii python3-enchant 1.6.6-2 all spellchecking library for Python 3
ii wamerican 7.1-1 all American English dictionary words for /usr/share/dict
ii wbritish 7.1-1 all British English dictionary words for /usr/share/dict
How should I fix this?
To fix the problem we need to install only one package related to Sonnet:
sonnet-plugins (see packages.ubuntu.com)
spell checking library for Qt
with
sudo apt-get install sonnet-plugins
as it depends on almost all spell-engines - aspell, hunspell, hspell, voikko
and then restart Kate.
It is strange why I have not it installed before. It was recommended by other installed library:
$ aptitude why sonnet-plugins
i sonnet-plugins Depends libkf5sonnetcore5 (>= 4.96.0)
i A libkf5sonnetcore5 Recommends sonnet-plugins (= 5.18.0-0ubuntu1)