I get the following error message when trying a network upgrade from 10.04 to 10.10:

authentication failed. authenticating the upgrade failed. there may be a problem with the network or with the server

I googled that error and found one proposed solution:

gpg --keyserver keyserver.ubuntu.com --recv 437D05B5

gpg --export --armor 437D05B5 | apt-key add -

However, this seems to have screwed up at least one guy's system.

Is there any safer way of solving this (besides doing a fresh install)?

  • R u behind proxy. – Deepak Rajput Oct 19 '11 at 6:57
  • Are you still experiencing this issue? – Bruno Pereira Mar 9 '12 at 8:23
  • I forgot about this question! The suggested answer did not do anything. After several tries I found a workaround - I'll post it as an answer – geoffrey Mar 9 '12 at 8:45

I did not solve this directly, but found a workaround: I put the latest Ubuntu (11.10) on a USB stick, booted to USB, and selected 'upgrade Ubuntu' from the options. Worked fine.


In my case, I started ubuntu manager from the terminal to find the error. The problem was that /etc/apt/trusted.gpg could not be read.

sudo chmod +r /etc/apt/trusted.gpg

fixed the problem.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.