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W: GPG error: http://download.opensuse.org  Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 85753AA5EEFEFDE9
W: GPG error: http://download.opensuse.org  Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51AFC9B27331E9C4 thx
Jorge Castro
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mat
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    why have you got an opensuse repo? Untick this in your software sources if my first thought... – fossfreedom Dec 28 '11 at 20:22
  • thanks a lot men it is going and the error is no more :) how easy i have linux 1.st time so you see it – mat Dec 28 '11 at 21:33

1 Answers1

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converted comment to answer

The error you see is due to you having added a OpenSuse repository.

Search in Dash for software sources and untick the OpenSuse repositories you see in the Other Software tab.

Close and the refresh Update Manager

Alternatively - from a terminal run

sudo apt-get update && sudo apt-get upgrade
fossfreedom
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