Comment 55 for bug 114375

I grammar checking in the Linux version actually included? Having had a look at the manual here (http://www.numbertext.org/lightproof/sentencecheck.pdf), I could not get it working. As far as I understood, a functioning LightProof grammar checker depends on the existence of the right dictionary "English spelling and hyphenation dictionaries and thesaurus 2011.12.05". This extension seems to be not coming with the Ubuntu PPA. At least in my extension manager it is missing and I could not find it anywhere on the internet.
Is my assumption right that the Lightproof grammar checker is missing on Linux?