Ubuntu discontinued the use of /etc/network/interfaces a number of releases ago and in 19.10 have removed ifupdown. Please see the migrating to netplan document:
https://wiki.ubuntu.com/MigratingToNetplan If you need to continue using /etc/network/interfaces then there are ways to install ifupdown and disable netplan. I am closing this as invalid. ** Changed in: network-manager (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1844763 Title: file /etc/network/interfaces is missing in eoan-desktop-amd64.iso Status in network-manager package in Ubuntu: Invalid Bug description: The file /etc/network/interfaces is missing after install guestOS with eoan-desktop-amd64.iso(daily build Sep-17-2019) in ESXi. This issue cause a failure for VMware Guest OS Customization To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1844763/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp