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I can't update 12.04 LTS. The Update Manager shows this:

CD/DVD 'Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)' is required
Please insert the above CD/DVD into the drive '/media/cdrom/' to install software packages from it.

The image I downloaded and burned to CD is from http://releases.ubuntu.com/12.04/ the PC (Intel x86) desktop CD version. I burned many CDs but the result is the same.

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Instead of burning multiple images Ubuntu has a nice check feature for it's disks. You simply wait until you see the purple screen (with what looks like a man in a circle) on CD boot and then press "ESC" before you see the Ubuntu splash logo. There should be an option to check disk image. Also, try going to the Ubuntu Software Center, edit menu and software sources. On the other software tab what is selected? –  KI4JGT Aug 21 '12 at 8:03
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CDs aren't used for regular updates. They download via the internet. Also, AFAIK, there's only one 12.04 LTS, although the title of your question confusingly suggests you are updating 12.04 to 12.04, so could you clarify what you are trying to do?. –  Jazz Aug 21 '12 at 8:06
    
possible duplicate of this –  André Stannek Aug 21 '12 at 8:07
    
There are 3 updates in Update manager that require this: CD/DVD 'Ubuntu 12.04 LTS Precise Pangolin - Release i386 (20120423)' is required "Please insert the above CD/DVD into the drive '/media/cdrom/' to install software packages from it." 2 Recommended updates: Daemon which notifies about package updates update-notifier (Size:57 kB) Files shared between update-notifier and other packages –  Adi Aug 21 '12 at 9:02
    
There are 3 updates in Update manager that require this: CD/DVD 'Ubuntu 12.04 LTS Precise Pangolin - Release i386 (20120423)' is required "Please insert the above CD/DVD into the drive '/media/cdrom/' to install software packages from it." 2 Recommended updates: Daemon which notifies about package updates update-notifier (Size:57 kB) Files shared between update-notifier and other packages 1 Distribution updates Apply a diff file to an original pach (New Install)(Size:87 kB) I know that my ubuntu downloads any new updates and I was suprised when this started to show up. –  Adi Aug 21 '12 at 9:09

2 Answers 2

Try opening your terminal and typing in sudo apt-get update.

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That doesn't actually upgrade any packages; it just updates information about what packages are available, in what versions, and from where. After running sudo apt-get update, to actually upgrade packages to their latest available versions (i.e., to "update the system"), you must run sudo apt-get upgrade and/or sudo apt-get dist-upgrade. See man apt-get for details. –  Eliah Kagan Aug 21 '12 at 13:30

Go to Ubuntu Software Center > Edit > Software Sources and make following changes: Uncheck the Cdrom option in Ubuntu Software.Also make sure that you have marked all the other options. Software Sources

Now go to Other Software and uncheck the Cdrom options. Software Sources

Now try running sudo apt-get update

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Allright!! I did all that you told me and it worked! Thank you for all youre help! –  Adi Aug 21 '12 at 9:42
    
This was helpful. I was just trying to install ubuntu tweak when i got this message. Why are these options enabled by default? –  JohnMerlino Dec 26 '13 at 16:36

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