I am using Ubuntu 15.10 and 64-bit system.
I am new to Ubuntu I am trying to use sudo apt-get update
but I am getting error I am not able to understand what is wrong and I don't know how to rectify that error.
Below is my error after using the command.
Get:58 http://us.archive.ubuntu.com wily-updates/multiverse amd64 Packages [6,431 B]
Get:59 http://us.archive.ubuntu.com wily-updates/main i386 Packages [255 kB]
Get:60 http://us.archive.ubuntu.com wily-updates/restricted i386 Packages [20.4 kB]
Get:61 http://us.archive.ubuntu.com wily-updates/universe Sources [3,560 B]
Err http://us.archive.ubuntu.com wily-updates/multiverse Sources
404 Not Found [IP: 91.189.91.13 80]
Err http://us.archive.ubuntu.com wily-updates/main amd64 Packages
404 Not Found [IP: 91.189.91.13 80]
Err http://us.archive.ubuntu.com wily-updates/restricted amd64 Packages
404 Not Found [IP: 91.189.91.13 80]
Err http://us.archive.ubuntu.com wily-updates/universe amd64 Packages
404 Not Found [IP: 91.189.91.13 80]
Get:62 http://us.archive.ubuntu.com wily-updates/multiverse i386 Packages [107 kB]
Ign http://us.archive.ubuntu.com wily-updates/main Translation-en
Ign http://us.archive.ubuntu.com wily-updates/multiverse Translation-en
Get:63 http://us.archive.ubuntu.com wily-updates/universe Translation-en [2,501 B]
Get:64 http://us.archive.ubuntu.com wily-updates/restricted Sources [60.5 kB]
Err http://us.archive.ubuntu.com wily-updates/universe i386 Packages
404 Not Found [IP: 91.189.91.13 80]
Ign http://us.archive.ubuntu.com wily-updates/restricted Translation-en
Fetched 32.1 MB in 4min 59s (107 kB/s)
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/wily-updates/restricted/source/Sources Hash Sum mismatch
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/wily-updates/universe/source/Sources Hash Sum mismatch
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/wily-updates/multiverse/source/Sources 404 Not Found [IP: 91.189.91.13 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/wily-updates/main/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/wily-updates/restricted/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/wily-updates/universe/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/wily-updates/universe/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/wily-updates/multiverse/binary-i386/Packages Hash Sum mismatch
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/wily-updates/universe/i18n/Translation-en Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.