Thanks for your response. I looked a bit more into it, and it seems that the official recommended way of dealing with this problem is the symlink approach, and that en-GB is explicitly provided by the en-US package - the compiler of the thesaurus intentionally combined both languages' spelling variants as synonyms within the same thesaurus.
http://astarix.co.uk/2012/06/proper-british-language-tools-libreoffice/ https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=749204 https://askubuntu.com/questions/42850/how-do-i-add-english-uk-thesaurus-and-other-locales-to-libreoffice In fact, it even gives the right British-English options. When I test it in LibreOffice, and search for the word "hue", it prompts me with both "color" (USA) and "colour" (GB). Similarly, it offers "aluminium" and "aluminum" as synonyms, and "pavement" and "sidewalk". So, please reconsider - or at least create a metapackage "mythes-en-GB" which depends on "mythes-en" and contains the symlinks. (After all, should a better solution arise i.e. someone compiles a dedicated en-GB thesaurus, we can always improve, but this approach gets 99.9% of the way there, vs. nothing, - and in the unlikely event that the GB-user ends up with a US-english word, such as "color", it is already caught by the GB-english spellchecker). ** Bug watch added: Debian Bug tracker #749204 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=749204 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to libreoffice-dictionaries in Ubuntu. https://bugs.launchpad.net/bugs/1923040 Title: en-gb thesaurus is missing Status in libreoffice-dictionaries package in Ubuntu: Won't Fix Bug description: Problem: The EN-GB thesaurus is missing for LibreOffice. To observe: 1. Fresh install of 21.04, set Location to United Kingdom. 2. Start LibreOffice Writer, choose the Tools menu. 3. The "Thesaurus" item is greyed out. Root cause: there is no mythes-en-gb package available (but there is mythes-en-us). Workaround: Give British English speakers the American English thesaurus i.e. symlink the US thesaurus by the GB one. cd /usr/share/mythes; ln -s th_en_US_v2.dat th_en_GB_v2.dat; ln -s th_en_US_v2.idx th_en_GB_v2.idx; Note: this report and tested workaround is on a fresh install of 21.04, although this problem has been extant for years. There appears to be no GB version of the thesaurus. However, as UK-english and USA- english language is so similar, it would be OK to provide the thesaurus from the US package in the meantime as a symlink. For others who find this bug report while searching the same issue, note that en-us is "english united-states" en-gb is "english great-britain", -uk is "ukraine". (Don't look for "english united-kingdom", en-uk, which doesn't exist). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libreoffice-dictionaries/+bug/1923040/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp