Failed restoring from backup

Thanks for the quick reply.

I have read the 2 posts you included in your reply.

Modifying the org.ops4j.pax.url.mvn.cfg file didn’t seem to solve the issue.

From reading the other post, I understand that installing the openhab-addons package was the solution.

How do I install it? Is it by running the following?

sudo apt-get install openhab-addons

Trying to do so displays a message that it will also REMOVE the openhab2 package - is it OK?

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libbrotli1 libc-ares2 libuv1 nodejs-doc
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
  openhab
Suggested packages:
  default-jre | java11-runtime | java11-runtime-headless
The following packages will be REMOVED:
  openhab2
The following NEW packages will be installed:
  openhab openhab-addons
0 upgraded, 2 newly installed, 1 to remove and 131 not upgraded.
Need to get 296 MB of archives.
After this operation, 212 MB of additional disk space will be used.