Steve T
(Back from the salt mine of my son's backyard landscaping)
Thanks Steve. That worked (deleting JMRI directory before extracting 4.18 upgrade and copying)
Can I suggest a small change to web page (jmri.org/install/Raspbian.shtml) where currently it says "You should therefore not expand the download into the same place as an existing JMRI installation. Instead, expand it into a separate location, and move in to it's final destination, completely replacing any previous version of JMRI."
I followed that procedure and that resulted in the error. Following your advice I deleted the JMRI directory and then copied the extracted files from the download directory. This fixed the problem.
Eg
" Instead, expand it into a separate location, backup any user created files in the JMRI directory and delete the JMRI directory. Then move the extracted JMRI directory and its contents in to it's final destination, completely replacing any previous version of JMRI."
Graeme Brooker
(Small donation made to JMRI)
