Question

ubuntu apt-get update "404 Not Found"

root@xzhu70:~# apt-get update
Ign http://mirrors.digitalocean.com utopic InRelease
Ign http://mirrors.digitalocean.com utopic-updates InRelease
Ign http://security.ubuntu.com utopic-security InRelease
Ign http://mirrors.digitalocean.com utopic-backports InRelease
Ign http://mirrors.digitalocean.com utopic Release.gpg
Ign http://security.ubuntu.com utopic-security Release.gpg
Ign http://mirrors.digitalocean.com utopic-updates Release.gpg
Ign http://mirrors.digitalocean.com utopic-backports Release.gpg
Ign http://security.ubuntu.com utopic-security Release
Ign http://mirrors.digitalocean.com utopic Release
Ign http://mirrors.digitalocean.com utopic-updates Release
Ign http://mirrors.digitalocean.com utopic-backports Release
Err http://security.ubuntu.com utopic-security/main Sources
  404  Not Found [IP: 91.189.92.201 80]
Err http://security.ubuntu.com utopic-security/restricted Sources
  404  Not Found [IP: 91.189.92.201 80]
Err http://security.ubuntu.com utopic-security/universe Sources
  404  Not Found [IP: 91.189.92.201 80]
Err http://security.ubuntu.com utopic-security/multiverse Sources
  404  Not Found [IP: 91.189.92.201 80]

Note that I have searched previous questions and tried the following suggestions in the previous answers:

rm -rf /var/lib/apt/lists/
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Ubuntu 14.10 (Utopic Unicorn) reached “End of Life” on July 23, 2015 and is no longer supported. Ubuntu has recently remove it from their official mirrors. If you still require the Apt repositories for it, you’ll need to edit your /etc/apt/source.list to point to:

http://old-releases.ubuntu.com/

We’ve also set up a mirror for it at:

http://mirrors.digitalocean.com/ubuntu-old

Though you are strongly encouraged to upgrade to a more recent release. Security updates are no longer provided for any packages in 14.10. We are providing that repository as a convenience and temporary work around for those who haven’t upgraded to a supported release yet.