Ubuntu 14.04 Suddenly missing public key

Bugs and issues Linux
#1

Yesterday everything was fine, but today when I ran sudo apt-get update I received this error:

    W: GPG error: http://apt.insync.io trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 06BBDC2602DFE7E7 W: GPG error: http://apt.insynchq.com trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 06BBDC2602DFE7E7

I have no idea why there is now no key. Do you happen to know how I can/should fix this?

Thank you,

John

#2

@John_Niendorf Could you retry? It might have just been a temporary network issue.

#3

It seems this is a bug that has been a problem for a while:
https://bugs.launchpad.net/ubuntu/+s...t/+bug/1263540
The bottom line is I went to /etc/apt/trusted.gpg.d and deleted what seemed to be the offending keys (or temp copies of keys since they all ended with ~).
It seems that the existence of these empty files interfered with the gpg keyblock resource limit. Who knew there was such a thing? Not I.
Anyway once I deleted these files I ran: sudo apt-get update again and then one by one added every key that had been blocked on to the main /etc/apt/trusted.gpg keyring with apt-key adv