Apt supports only up to 40 GPG keys and provides unhelpful error messages when there are more than 40

Bug #1550789 reported by Tal Liron on 2016-02-27
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
apt (Ubuntu)
Undecided
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Bug Description

First of all, the 40 key limit is unrealistic for heavy Ubuntu users. None of my 40+ keys is meaningless. I use many repositories, including PPAs, for various reasons.

But, when you do hit the limit, you get very unhelpful error messages, such as this:

W: GPG error: http://mirrors.gigenet.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32

Nowhere are you told that you have too many keys, and nowhere do you get a suggestion no how to solve this error.

See, for example, this bug for the confusion that this causes:

https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1263540

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