Could not fetch the package cache information lists. - Repository Change

[stevef]

The message indicates that the Azul Systems repository has changed some of the release information about the package.

The update/upgrade process requires indication from the system user that this Azul Systems change is OK.
To accept the change, open a terminal (press 3 keys 'Ctrl' 'Alt' 'T' together) and enter run this command followed by return.

Code:

sudo apt-get --allow-releaseinfo-change update

Enter your password if asked.
This informs the update process that you accept the change.
Once the update process is done, complete the upgrade with this command answering any prompts to confirm.

Code:

sudo apt-get upgrade