On my 18.04 i have copied the content of proxy.conf to apt.conf and it worked
sudo cp /etc/apt/apt.conf.d/proxy.conf /etc/apt/apt.conf -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1730672 Title: Proxy settings not applied system-wide, are not used by Software Update or apt To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1730672/+subscriptions -- desktop-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
