I was running Medusa 0.4.6 which was meant to be the last version that would run on Python 2.7
I've just logged into the web interface and there was an update notification (19 new commits ) so thinking it was a bugfix as 0.4.6 was only relased a few days ago I updated.
It killed the Medusa web interface and probably lots of other stuff as it transpires that the new update was indeed for Python3 only.
I've reinstalled Medusa but I'm now stuck on 0.3.4 and it sees no updates.
So just a quick warning to anyone running Medusa,please don't update to todays 0.5.1 release
Medusa for *ELEC 9.2 has been updated to version 0.4.6
If you inadvertently update it to a later version simply 'update' the add-on to revert to version 0.4.6