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Today I received an update notification for three updates but update manager doesn't say what updates are they.

No details of updates

Does anyone have a clue what this is about? How am I to check what is to be updated?

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What does the terminal say? sudo apt-get upgrade – wojox Aug 12 '13 at 14:18
Few days back i got the same error, so i did upgrade from terminal ( sudo apt-get upgrade ). – Qasim Aug 12 '13 at 17:16
Do we have a bug report for this? If not, someone should create one. I didn't think to capture a screen shot, but you have one here that would be good to include in a bug report. – PJ Singh Aug 12 '13 at 17:55
I just opened Bug #1211511 for this issue. I was able to grab a an apport log and a screenshot of the problem. Please confirm this bug if you are impacted by it: – PJ Singh Aug 12 '13 at 21:12
Could it be that the upgrade-able packages are libraries and other "system" packages, and therefore hidden? (this could be done to confuse the user less about the updated packages, (s)he would probably only care if "Firefox" is updated?) – Lekensteyn Aug 13 '13 at 20:50

Dont worry . I have been through this . so to clarify that I have done that in terminal with

sudo apt-get upgrade

and It has listed the outputs. only 3 upgrades will be there If i remember correctly.

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Even if that solved the issue, it has to be reported as a bug. Help the whole community! – Lucio Aug 12 '13 at 20:38
@Lucio , I agree with your opinion. – Raja Aug 13 '13 at 1:10

I just had this identical problem just now (2013-08-16) and I ran sudo apt-get upgrade to fix it:

The following packages will be upgraded:
  command-not-found command-not-found-data libplymouth2 plymouth
  plymouth-label plymouth-theme-ubuntu-text plymouth-x11
8 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I can quite see Lekensteyn's point about not confusing the end-user, but it would perhaps be better to list "software libraries and packages for internal management" or something like, just to avoid the empty window.

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