The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B7E65990E879472F

[maifeeulasad]

Operating System/Distribution

Ubuntu 20.04 LTS

Installer

Which version of the app?
Which installer type?

What happened?

Get:11 https://packagecloud.io/shiftkey/desktop/any any InRelease [23.2 kB]
Err:11 https://packagecloud.io/shiftkey/desktop/any any InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B7E65990E879472F
Reading package lists... Done
N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'https://download.mono-project.com/repo/ubuntu stable-focal InRelease' doesn't support architecture 'i386'
W: GPG error: https://packagecloud.io/shiftkey/desktop/any any InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B7E65990E879472F
E: The repository 'https://packagecloud.io/shiftkey/desktop/any any 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.

[shiftkey]

Not sure of what's happened here, but I as this is from PackageCloud there's not much I can do aside from suggest you try again.

I'm thinking of moving away from PackageCloud, please follow along with #278 for the latest...