Install via apt on Debian 11 : The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9BCA8B4F51A082C4

[canardo909]

Problem when trying to install Vidcutter on Debian GNU/Linux 11 (bullseye) :

W: GPG error: http://ppa.launchpad.net/ozmartian/apps/ubuntu jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9BCA8B4F51A082C4 E: The repository 'http://ppa.launchpad.net/ozmartian/apps/ubuntu jammy InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default.

DETAILED STEPS

sudo add-apt-repository ppa:ozmartian/apps [ OFFICIAL VidCutter PPA ]

Welcome to the official Ubuntu-flavoured home of VidCutter.

If packages for your distro are unavailable please try installing via Snap or Flatpak.

SNAP = https://snapcraft.io/vidcutter Flatpak = https://flathub.org/apps/details/com.ozmartians.VidCutter More info: https://launchpad.net/~ozmartian/+archive/ubuntu/apps Press [ENTER] to continue or ctrl-c to cancel adding it

gpg: keybox '/tmp/tmpdya06pnr/pubring.gpg' created gpg: /tmp/tmpdya06pnr/trustdb.gpg: trustdb created gpg: key 9BCA8B4F51A082C4: public key "Launchpad PPA for ozmartian" imported gpg: Total number processed: 1 gpg: imported: 1 Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)). gpg: no valid OpenPGP data found.

sudo apt update Hit:1 http://deb.debian.org/debian bullseye InRelease Hit:2 http://deb.debian.org/debian-security bullseye-security InRelease
Hit:3 http://deb.debian.org/debian bullseye-updates InRelease
... ... Err:3 http://ppa.launchpad.net/ozmartian/apps/ubuntu jammy InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9BCA8B4F51A082C4 ... ... Reading package lists... Done W: GPG error: http://ppa.launchpad.net/ozmartian/apps/ubuntu jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9BCA8B4F51A082C4 E: The repository 'http://ppa.launchpad.net/ozmartian/apps/ubuntu jammy InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default.

[canardo909]

Same test performed on Linux Mint 20.3 and it works OK.

It seems to be a Debian 11 specific problem

[canardo909]

Tested ok with Ubuntu 20.04 LTS

Tested NOT OK with Debian 10 (Buster)

So far, error is present in both Debian 10 and 11

[cpcbegin]

Same problem in Debian 12.