The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F [duplicate]

When I type sudo apt update I get this response:

Get:1 bionic InRelease [6,242 B]
Ign:2 stable InRelease
Hit:3 stable Release
Err:1 bionic InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
Hit:5 bionic InRelease
Hit:6 bionic InRelease
Hit:7 bionic-updates InRelease
Hit:8 bionic-backports InRelease
Hit:9 bionic-security InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
W: Failed to fetch The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 76F1A20FF987672F
W: Some index files failed to download. They have been ignored, or old ones used instead.

I've try to use sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-key 76F1A20FF987672F to fix it, but noting is fixed:

gpg:keyserver receive failed: No data

How can I fix this? I uninstalled wine last week; have I not fully uninstalled it?

6 Sorted by: Reset to default