From Mainlog.txt:
2018-01-27 17:47:39,498 ERROR IOError/SystemError in cache.update(): 'E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful-updates/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful-backports/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful-security/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Some index files failed to download. They have been ignored, or old ones used instead.'. Retrying (currentRetry: 0) 2018-01-27 17:47:42,087 ERROR IOError/SystemError in cache.update(): 'E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful-updates/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful-backports/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful-security/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Some index files failed to download. They have been ignored, or old ones used instead.'. Retrying (currentRetry: 1) 2018-01-27 17:47:44,662 ERROR IOError/SystemError in cache.update(): 'E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful-updates/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful-backports/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/artful-security/main/binary-arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Some index files failed to download. They have been ignored, or old ones used instead.'. Retrying (currentRetry: 2)
From Mainlog.txt:
2018-01-27 17:47:39,498 ERROR IOError/SystemError in cache.update(): 'E:Failed to fetch http:// us.archive. ubuntu. com/ubuntu/ dists/artful- updates/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http:// us.archive. ubuntu. com/ubuntu/ dists/artful- backports/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http:// us.archive. ubuntu. com/ubuntu/ dists/artful- security/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http:// us.archive. ubuntu. com/ubuntu/ dists/artful/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Some index files failed to download. They have been ignored, or old ones used instead.'. Retrying (currentRetry: 0) us.archive. ubuntu. com/ubuntu/ dists/artful/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http:// us.archive. ubuntu. com/ubuntu/ dists/artful- updates/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http:// us.archive. ubuntu. com/ubuntu/ dists/artful- backports/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http:// us.archive. ubuntu. com/ubuntu/ dists/artful- security/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Some index files failed to download. They have been ignored, or old ones used instead.'. Retrying (currentRetry: 1) us.archive. ubuntu. com/ubuntu/ dists/artful/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http:// us.archive. ubuntu. com/ubuntu/ dists/artful- updates/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http:// us.archive. ubuntu. com/ubuntu/ dists/artful- backports/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Failed to fetch http:// us.archive. ubuntu. com/ubuntu/ dists/artful- security/ main/binary- arm64/Packages 404 Not Found [IP: 91.189.91.26 80], E:Some index files failed to download. They have been ignored, or old ones used instead.'. Retrying (currentRetry: 2)
2018-01-27 17:47:42,087 ERROR IOError/SystemError in cache.update(): 'E:Failed to fetch http://
2018-01-27 17:47:44,662 ERROR IOError/SystemError in cache.update(): 'E:Failed to fetch http://