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<div>Hi, I am using LinuxMint20 and trying to update to the latest SANE by using "sane-project team" link: https://launchpad.net/~sane-project/+archive/ubuntu/sane-release</div>
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<div>First command in terminal: sudo add-apt-repository ppa:sane-project/sane-release</div>
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<div>You are about to add the following PPA:<br/>
Ubuntu SANE packages from SANE Stable Source (https://gitlab.com/sane-project/backends/-/releases).</div>
<div>Please send scanner related questions to the SANE mailing list:<br/>
sane-devel at alioth-lists dot debian dot net.</div>
<div>If you need the more recent scanner driver from git, you can use my other PPA: https://launchpad.net/~sane-project/+archive/ubuntu/sane-git.<br/>
More info: https://launchpad.net/~sane-project/+archive/ubuntu/sane-release<br/>
Press Enter to continue or Ctrl+C to cancel</div>
<div>Executing: /tmp/apt-key-gpghome.4XgmtlN5t8/gpg.1.sh --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys B5904B171A07B33815710C02DDEAC554C101175B<br/>
gpg: key DDEAC554C101175B: public key "Launchpad PPA for sane-project" imported<br/>
gpg: Total number processed: 1<br/>
gpg: imported: 1<br/>
gpg: invalid key resource URL '/etc/apt/trusted.gpg.d/home:pzz.gpg'<br/>
gpg: keyblock resource '(null)': General error<br/>
gpg: key 23E07629B9E3C9E4: 1 signature not checked due to a missing key<br/>
gpg: key A6616109451BBBF2: 12 signatures not checked due to missing keys<br/>
gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys<br/>
gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys<br/>
gpg: key C8CAB6595FDFF622: 2 signatures not checked due to missing keys<br/>
gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key<br/>
gpg: Total number processed: 8<br/>
gpg: skipped new keys: 8</div>
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<div>Second command in terminal: sudo apt update</div>
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<div>Get:12 http://ppa.launchpad.net/sane-project/sane-release/ubuntu focal InRelease [18.0 kB]<br/>
Err:9 http://ppa.launchpad.net/sane-project/sane-git/ubuntu focal InRelease<br/>
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DDEAC554C101175B<br/>
Err:12 http://ppa.launchpad.net/sane-project/sane-release/ubuntu focal InRelease<br/>
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DDEAC554C101175B<br/>
Reading package lists... Done<br/>
W: GPG error: http://ppa.launchpad.net/sane-project/sane-git/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DDEAC554C101175B<br/>
E: The repository 'http://ppa.launchpad.net/sane-project/sane-git/ubuntu focal InRelease' is not signed.<br/>
N: Updating from such a repository can't be done securely, and is therefore disabled by default.<br/>
N: See apt-secure(8) manpage for repository creation and user configuration details.<br/>
W: GPG error: http://ppa.launchpad.net/sane-project/sane-release/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DDEAC554C101175B<br/>
E: The repository 'http://ppa.launchpad.net/sane-project/sane-release/ubuntu focal InRelease' is not signed.<br/>
N: Updating from such a repository can't be done securely, and is therefore disabled by default.<br/>
N: See apt-secure(8) manpage for repository creation and user configuration details.</div>
<div>I tried adding the fingerprint B5904B171A07B33815710C02DDEAC554C101175B through Update Manager and receive the following error:</div>
<div>Failed to download repository information check your internet connection.</div>
<div>W:GPG error: http://ppa.launchpad.net/sane-project/sane-git/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DDEAC554C101175B, E:The repository 'http://ppa.launchpad.net/sane-project/sane-git/ubuntu focal InRelease' is not signed., W:Updating from such a repository can't be done securely, and is therefore disabled by default., W:See apt-secure(8) manpage for repository creation and user configuration details., W:GPG error: http://ppa.launchpad.net/sane-project/sane-release/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DDEAC554C101175B, E:The repository 'http://ppa.launchpad.net/sane-project/sane-release/ubuntu focal InRelease' is not signed.</div>
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<div>1. Is there a recommended way I can import this unsigned key? I have also tried importing the GPG signature with "apt-key add" and no joy.</div>
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