$ sudo apt update && apt full-upgrade
sudo: unable to resolve host developer
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Get:2 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Hit:3 http://in.archive.ubuntu.com/ubuntu xenial InRelease
Ign:4 http://linux.dropbox.com/ubuntu wily InRelease
Get:5 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Get:6 http://linux.dropbox.com/ubuntu wily Release [6,596 B]
Hit:7 http://archive.canonical.com/ubuntu xenial InRelease
Hit:8 http://dl.google.com/linux/chrome/deb stable Release
Hit:9 https://repo.skype.com/deb stable InRelease
Hit:11 http://archive.canonical.com xenial InRelease
Ign:12 http://www.scootersoftware.com stable InRelease
Get:14 http://in.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Hit:15 http://www.scootersoftware.com stable Release
Hit:17 https://download.sublimetext.com apt/stable/ InRelease
Ign:18 https://s3.amazonaws.com/repo.deb.cyberduck.io stable InRelease
Hit:19 https://s3.amazonaws.com/repo.deb.cyberduck.io stable Release
Get:20 https://s3.amazonaws.com/repo.deb.cyberduck.io stable Release.gpg [819 B]
Ign:20 https://s3.amazonaws.com/repo.deb.cyberduck.io stable Release.gpg
Reading package lists... Done
W: Target Packages (partner/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Packages (partner/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Packages (partner/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Translations (partner/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Translations (partner/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target DEP-11 (partner/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target DEP-11-icons (partner/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: http://www.scootersoftware.com/dists/stable/Release.gpg: Signature by key C9467A8216C570CDFBAC3AFD331D6DDE7F8840CE uses weak digest algorithm (SHA1)
W: GPG error: https://s3.amazonaws.com/repo.deb.cyberduck.io stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FE7097963FEFBE72
E: The repository 'https://s3.amazonaws.com/repo.deb.cyberduck.io stable Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: Target Packages (partner/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Packages (partner/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Packages (partner/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Translations (partner/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target Translations (partner/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target DEP-11 (partner/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4
W: Target DEP-11-icons (partner/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:43 and /etc/apt/sources.list.d/xenial-partner.list:4