Nokia N900: NO_PUBKEY ADB4438160A655EF

When running an apt-get update on my phone, I got the following error:

Reading package lists... Done
W: GPG error: https://downloads.maemo.nokia.com ./ Release: The
following signatures couldn't be verified because the public key is not
available: NO_PUBKEY ADB4438160A655EF W: You may want to run apt-get
update to correct these problems

Running update again does of course not help and will give you the same error again.

Trying to import the key with

gpg --keyserver subkeys.pgp.net --recv-keys ADB4438160A655EF

does also not work, because the key is just not there.

So after trying this, I went the hard way and disabled all package sources in /etc/apt/sources.list.d/hildon-application-manager.list, running an apt-get update after enabling each separately. The offending line was

deb https://downloads.maemo.nokia.com/fremantle1.2/ovi/ ./

Which I simply removed, since I'm on fremantle 1.3 anyway.

Written by Christian Weiske.

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