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[EN/LT] 'apt-get update' error: Some index files failed to download ...

If you get the following or similar error on Ubuntu 14.10 OS when your execute command apt-get update (error output could be different because when you use x64 or x86 OS),

[email protected]:~# apt-get update
Ign utopic InRelease
Ign utopic Release.gpg
Ign utopic Release
Err utopic/main amd64 Packages
  404 Not Found [IP: 80]
Ign utopic/main Translation-en
W: Failed to fetch 404 Not Found [IP: 80]

E: Some index files failed to download. They have been ignored, or old ones used instead.

It means the command execution is failed because Ubuntu changed repository server address.
On this case the cause is ended Ubuntu 14.10 support (until 23rd of July, 2015).

1. We have to update sources.list file using the following command

  editor /etc/apt/sources.list

2. You should find the following line inside

  deb utopic main

This line should be changed to:

  deb utopic main

3. Save modified file by pressing CTRL+X, to confirm press 'Y' and again press ENTER.

Now execute apt-get update command once again.

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