Can't access HA from reinstalled host OS

I’ve been using HA installed on a PI for over couple of years, and have been accessing it using firefox from an Xubuntu installation on a laptop, from my mobile 'phone and using firefox on a windows computer. I can also access the HA installation with ssh from the laptop, and also access the web page from outside using a duckdns account

I’ve had to reinstall Xubuntu on the laptop, but can no longer access the web page, with a connection refused error.

The problem appears to be related to the new installation of Xubuntu, as the other devices are not affected.

I’m at a loss as to where to go now, and could do with a bit of ‘hand holding’ , please!

Jim

Seems to have sorted itself out overnight. I’ve got no idea how or why!

Jim