Hi Morris,
On Linux Mint 18.2 the help files are located in
/usr/share/docs/gnucash-docs. The display of the tutorial guide and manual
by Gnucash uses the gnome Yelp help browser. It may be this is not installed
in the raspberryPi Linux version.
New user/installation on RaspberryPi.
When I select Help/Tutorial and Concepts Guide, I get the message:
"GnuCash could not find the files for the help documentation. This is
likely because the 'gnucash-docs' package is not installed."
dpkg --list | grep gnucash reports:
ii gnucash 1:2.6.4-3