Missing public key after reinstall of Ubuntu 24.04.03

Bugs and issues
1

Following a resintall of Ubuntu 24.04.3 (after a disk failure) I have reinstalled insync. It is running well, but there’s an error when I run [sudo apt update] with output as follows

Advice welcome.

…

Err:5 http://apt.insync.io/ubuntu noble InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY A684470CACCAF35C
Get:6 Index of /apps/ubuntu/ noble-apps-security InRelease [8,371 B]
Get:7 Index of /apps/ubuntu/ noble-apps-updates InRelease [8,220 B]
…
Reading package lists… Done
W: GPG error: http://apt.insync.io/ubuntu noble InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY A684470CACCAF35C
E: The repository ‘http://apt.insync.io/ubuntu noble InRelease’ is not signed.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

2

Hello! Could you run this command:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ACCAF35C

Then try again, and let me know how it goes. Thank you!

3

Thanks Mia

Output from your command line is as follows:

Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
Executing: /tmp/apt-key-gpghome.WTJSWFmQWZ/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys ACCAF35C
gpg: key A684470CACCAF35C: public key “Insynchq Inc services@insynchq.com” imported
gpg: Total number processed: 1
gpg: imported: 1

Then from ‘sudo apt update’ in the following screenshot:

Screenshot from 2025-11-10 08-10-58
Screenshot from 2025-11-10 08-10-581715×354 80.3 KB

4

Hello! Could you please try the steps below, and let me know if it works?

5

Thanks Mia

Here you go

image
image1730×648 156 KB

I am wondering whether I should deinstall insync and reinstall again - I had tried this before contacting you but with the same result. So wondering if the deinstall wasn’t 100% clean in some way?

6

Let me know if you followed these steps: Uninstalling Insync | Insync Help Center

If not, go ahead and then reinstall using the link I shared earlier. Thank you!

7

Hi Mia
The deinstall and reinstall did work, thank you, but only after I removed insynch.list from /etc/apt/sources.list.d/
Hopefully that’s the end of the matter.
Thank you for your help throughout

1 Like
8

You are most welcome!