Upgraded Ubuntu - scan now stuck

Hi

I upgraded Ubuntu from 16.04LTS to 18.04LTS, and now the scan is stuck. e.g.



This page shows the progress of each phase of the scanning process.

Discovering files/directories: /mnt/music/Music (8104 of 8104) Complete 00:00:02

Scanning new music files: /mnt/music/Music (7435 of 7435) Complete 00:00:35


Abort scan



It's been like this for an hour. Does anyone have any suggestions? It still plays music, but a "clear and rescan" just does the same.

Many thanks


Jim