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I have Ubuntu 12.04 LTS , I have a red triangle appears at the top. why? I download updates when they arrive. Here is the result of the command typed :

mahmoud@mahmoud-HP-620:~$ sudo apt-get update [sudo] password for mahmoud: Ign precise InRelease Ign precise-updates InRelease
Ign precise-backports InRelease
Hit precise Release.gpg
Get:1 precise-updates Release.gpg [198 B]
Ign precise InRelease
Ign precise-security InRelease
Ign precise InRelease
Get:2 precise-backports Release.gpg [198 B] Hit precise Release.gpg
Get:3 precise-security Release.gpg [198 B]
Ign precise Release.gpg
Hit precise Release
Hit precise Release
Get:4 precise-security Release [49,6 kB]
Ign precise Release
Get:5 precise-updates Release [49,6 kB]
Hit precise/main Sources
Hit precise/main i386 Packages
Ign precise/main TranslationIndex
Ign precise/main TranslationIndex
Get:6 precise-security/main Sources [44,4 kB]
Get:7 precise-backports Release [49,6 kB]
Get:8 precise-security/restricted Sources [1 950 B] Get:9 precise-security/universe Sources [13,5 kB]
Get:10 precise-security/multiverse Sources [1 386 B] Get:11 precise-security/main i386 Packages [167 kB] Hit precise/main Sources
Hit precise/restricted Sources
Hit precise/universe Sources
Hit precise/multiverse Sources
Hit precise/main i386 Packages
Hit precise/restricted i386 Packages
Hit precise/universe i386 Packages
Hit precise/multiverse i386 Packages
Hit precise/main TranslationIndex
Hit precise/multiverse TranslationIndex
Hit precise/restricted TranslationIndex
Hit precise/universe TranslationIndex
Get:12 precise-updates/main Sources [168 kB]
Get:13 precise-updates/restricted Sources [3 285 B] Get:14 precise-security/restricted i386 Packages [3 968 B] Get:15 precise-security/universe i386 Packages [44,3 kB] Get:16 precise-updates/universe Sources [52,6 kB] Err precise/main Sources
404 Not Found Err precise/main i386 Packages
404 Not Found Get:17 precise-updates/multiverse Sources [4 241 B] Get:18 precise-updates/main i386 Packages [392 kB] Get:19 precise-security/multiverse i386 Packages [2 369 B] Hit precise-security/main TranslationIndex
Hit precise-security/multiverse TranslationIndex
Hit precise-security/restricted TranslationIndex
Hit precise-security/universe TranslationIndex
Ign precise/main Translation-en_US
Ign precise/main Translation-en
Ign precise/main Translation-fr
Ign precise/main Translation-en_US
Hit precise-security/main Translation-en
Hit precise-security/multiverse Translation-en
Hit precise-security/restricted Translation-en Ign precise/main Translation-en
Hit precise-security/universe Translation-en
Ign precise/main Translation-fr Get:20 precise-updates/restricted i386 Packages [6 732 B] Get:21 precise-updates/universe i386 Packages [132 kB] Get:22 precise-updates/multiverse i386 Packages [9 673 B] Hit precise-updates/main TranslationIndex Hit precise-updates/multiverse TranslationIndex Hit precise-updates/restricted TranslationIndex Hit precise-updates/universe TranslationIndex Get:23 precise-backports/main Sources [2 422 B] Get:24 precise-backports/restricted Sources [14 B] Get:25 precise-backports/universe Sources [14,5 kB] Get:26 precise-backports/multiverse Sources [2 669 B] Get:27 precise-backports/main i386 Packages [1 941 B] Get:28 precise-backports/restricted i386 Packages [14 B] Get:29 precise-backports/universe i386 Packages [12,9 kB] Get:30 precise-backports/multiverse i386 Packages [2 504 B] Hit precise-backports/main TranslationIndex Hit precise-backports/multiverse TranslationIndex Hit precise-backports/restricted TranslationIndex Hit precise-backports/universe TranslationIndex Hit precise/main Translation-en Hit precise/main Translation-fr Hit precise/multiverse Translation-en Hit precise/multiverse Translation-fr Hit precise/restricted Translation-en Hit precise/restricted Translation-fr Hit precise/universe Translation-en Hit precise/universe Translation-fr Hit precise-updates/main Translation-en Hit precise-updates/main Translation-fr Hit precise-updates/multiverse Translation-en Hit precise-updates/multiverse Translation-fr Hit precise-updates/restricted Translation-en Hit precise-updates/restricted Translation-fr Hit precise-updates/universe Translation-en Hit precise-updates/universe Translation-fr Hit precise-backports/main Translation-en Hit precise-backports/multiverse Translation-en Hit precise-backports/restricted Translation-en Hit precise-backports/universe Translation-en Fetched 1 233 kB in 2s (501 kB/s) 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. mahmoud@mahmoud-HP-620:~$

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Did you try moving the mouse over it, and possibly left or right clicking to see if either says anything? – Marty Fried Sep 21 '12 at 2:38
There is an update that needs to take place. Where is the red triangle appearing? – daslinkard Sep 21 '12 at 2:39
If you haven't updated LTS since shortly after it came out, it will want to run the updates and upgrade the kernel to 3.2.0-30 and do several other security updates. After updating the kernel it will then want to reboot. – fabricator4 Sep 21 '12 at 2:50

2 Answers 2

I had that triangle when I added the crebs ppa, which didn't exists anymore. Try sudo apt-get update and see if there is any errors.

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I can't understand why someone would downwote this answer. He has a broken ppa as I've said.There are two 404 errors in your sudo apt-get update output, which causes errors in update, which is the reason of the red caoution triangle. remove claudiocn ppa. The problem will heal. – user91091 Sep 22 '12 at 0:28
This is the correct answer. Some repositories change over time and ´apt-get update´ shows which one are not reachable. – Alex Aug 3 '14 at 6:57

Well there might be an error with one program that is running or it could be a background program running that messed up. The best way to find out what's wrong with it, would be to double click on it. Then it will get you the error and what's going on with this indicator. It might be a good idea to check out the system, by running check disk, and go into terminal and type in, "sudo apt-get update".

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