Spell checking never seems to work, by default, in Libre Office on a Raspberry Pi.
To get it working:
# Go to:
# Click on the Current Release or go to the below URL which
# is current as of now!
# Download the .oxt file
# In Libre Office go to Tools / Extension Manager
# Add the .oxt file
# Spell checking now works!
This has been tested on Jessie with the PIXEL Desktop. I haven’t tested it in previous versions. Substitute the IP address in fstab and the share name, as appropriate!
# Make a directory in /mnt
sudo mkdir /mnt/DataDisk
# Edit fstab:
sudo nano /etc/fstab
# Add a line with a similar format as below
//192.168.178.240/DataDisk /mnt/DataDisk cifs guest,iocharset=utf8,_netdev,x-systemd.automount 0 0
# Reboot and check that things mount OK after a reboot
sudo shutdown -r now