The procedure most be excecute as root (not sudo). It’s because npm uses original user Id.
Sorry, I update the steps above. Previously the installation guide (https://helpcenter.onlyoffice.com/server/linux/document/linux-installation.aspx) partially described how to solve this problem, but now it doesn’t and the shared assumes it is located in the SpellChecker directory. I update as follows:
sudo -i
npm install -g npm
apt-get install build-essential git
cd /var/www/onlyoffice/documentserver/server/SpellChecker/
supervisorctl stop all
mv node_modules/ node_modules_old/
apt-get update
apt-get dist-upgrade
supervisorctl start all
You can found other workarounds here: https://github.com/ONLYOFFICE/DocumentServer/issues/312
