My OS is Debian Stretch. My version of LibreOffice is 1:5.2.7-1+deb9u4 from the stretch-backports depository. The installed version of hunspell GB has the same as the version number as LO. The US version is 20070829-7.
I can open the Spelling window with F7. At the top of the window is a place to indicate text language, which when the window opens says <none>. The two options are English (UK) or English (USA). Preceding each option is a blue check mark with in a small font the letters ABC. When I click on one or other of these options nothing happens; the selection box still says <none>. So I cannot check spelling, or have hyphenated words.
Comments/suggestions anybody?
Regards, Ken