I am new to Linux environment. I am trying to install Bio Linux 8 on Ubuntu 15.04, but it is giving problem;

By using following command;

wget -qO- http://nebc.nerc.ac.uk/downloads/bl8_only/upgrade8.sh | sudo sh
W: Failed to fetch http://ppa.launchpad.net/nebc/bio-linux/ubuntu/dists/vivid/main/binary-amd64/Packages  404  Not Found
W: Failed to fetch http://ppa.launchpad.net/nebc/bio-linux/ubuntu/dists/vivid/main/binary-i386/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

There is also an error while updating;

sudo apt-get install update

Reading package lists... Done
Building dependency tree
Reading state information... Done
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ vivid-security/main amd64 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_vivid-security_main_binary-amd64_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ vivid-security/restricted amd64 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_vivid-security_restricted_binary-amd64_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ vivid-security/main i386 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_vivid-security_main_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ vivid-security/restricted i386 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_vivid-security_restricted_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
E: Unable to locate package update

Is there any idea how to solve this problem?

Thanks