When I visit the dashboard it tells me:
SolrCore initialization failures
The only warning line in
WARNING: New index directory detected: old=null new=/var/solr/data/index/
How can I solve this?
Answering my own question. I got to this stage after hunting down errors in the log and fixing them, and at the point I asked, there were no more errors in the log, but I did see this in the HTTP console.
It turns out there wasn't a problem after all. If you view the console with the command-line browser
So, if you see this error in the console after you have fixed errors in the logs, just try interacting with the API (or visit it in a 'real' browser) it may already be working.