W: Failed to fetch http://id.archive.ubuntu.com/ubuntu/dists/xenial/InRelease  Could not resolve 'welcome9.wifi.id'
W: Failed to fetch http://id.archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease  Could not resolve 'welcome9.wifi.id'
W: Failed to fetch http://id.archive.ubuntu.com/ubuntu/dists/xenial-backports/InRelease  Could not resolve 'welcome9.wifi.id'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease  Could not resolve 'welcome9.wifi.id'
W: Failed to fetch http://ppa.launchpad.net/gezakovacs/ppa/ubuntu/dists/xenial/InRelease  Could not resolve 'welcome9.wifi.id'
W: Failed to fetch http://ppa.launchpad.net/gns3/ppa/ubuntu/dists/xenial/InRelease  Could not resolve 'welcome9.wifi.id'
W: Failed to fetch http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu/dists/xenial/InRelease  Could not resolve 'welcome9.wifi.id'
W: Failed to fetch http://ppa.launchpad.net/noobslab/icons/ubuntu/dists/xenial/InRelease  Could not resolve 'welcome9.wifi.id'
W: Failed to fetch http://ppa.launchpad.net/noobslab/themes/ubuntu/dists/xenial/InRelease  Could not resolve 'welcome9.wifi.id'
W: Failed to fetch http://repository.spotify.com/dists/stable/InRelease  Could not resolve 'welcome9.wifi.id'
W: Some index files failed to download. They have been ignored, or old ones used instead.