sudo apt-get update not working [duplicate]

Err utopic/main amd64 Packages 404 Not Found
Get:63 utopic/universe Sources [6,736 kB]
Err utopic/main i386 Packages 404 Not Found
W: Failed to fetch 404 Not Found
W: Failed to fetch 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

What to do in this case ??

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1 Answer

Follow following steps

1. First Backup your old sources.list, mv /etc/apt/sources.list /etc/apt/sources.list.back

2. Check your OS version, Release

   lsb_release -r

3. Go to

4. Select Country

5. Select Ubuntu Release

6. Select Your choice. Important is first 12 and choose whatever you require

7. Generate new sources list

8. Open your editor like vi or vim

   vim /etc/apt/sources.list

9. Save the file

10. Retry with sudo apt-get update

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