Many answers on Ask Ubuntu direct to links like this that in Xubuntu opened in Ubuntu Software Center. In Lubuntu I get this error message:
In Firefox-Preferences/Applications cannot see something resembling to
apt to associate to a program etc.
Opening the same link in Chromium or Opera I get:
Clicking "I'm running Ubuntu" results in an error message like in Firefox.
What's the remedy? Can I install Ubuntu Software Center?