Getting error while installing ssh in Ubuntu 15.10

I have installed Java and Hadoop and now when trying to install ssh in my Ubuntu 15.10 getting below errors.

"Do you want to continue? [Y/n] Y
Err http://in.archive.ubuntu.com/ubuntu/ wily-updates/main openssh-client amd64 1:6.9p1-2ubuntu0.1
  404 Not Found [IP: 91.189.91.23 80]
Err http://security.ubuntu.com/ubuntu/ wily-security/main openssh-client amd64 1:6.9p1-2ubuntu0.1
  404 Not Found [IP: 91.189.88.152 80]
Err http://security.ubuntu.com/ubuntu/ wily-security/main openssh-sftp-server amd64 1:6.9p1-2ubuntu0.1
  404 Not Found [IP: 91.189.88.152 80]
Err http://security.ubuntu.com/ubuntu/ wily-security/main openssh-server amd64 1:6.9p1-2ubuntu0.1
  404 Not Found [IP: 91.189.88.152 80]
Err http://security.ubuntu.com/ubuntu/ wily-security/main ssh all 1:6.9p1-2ubuntu0.1
  404 Not Found [IP: 91.189.88.152 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-client_6.9p1-2ubuntu0.1_amd64.deb 404 Not Found [IP: 91.189.88.152 80]

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-sftp-server_6.9p1-2ubuntu0.1_amd64.deb 404 Not Found [IP: 91.189.88.152 80]

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-server_6.9p1-2ubuntu0.1_amd64.deb 404 Not Found [IP: 91.189.88.152 80]

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/ssh_6.9p1-2ubuntu0.1_all.deb 404 Not Found [IP: 91.189.88.152 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? "

I am new to ubuntu and please never mind if my question is invalid. Please suggest me how can I fix this error. Thanks-Srinu.