ArchLinux Pacman: signature is unknown trust

gistfile1.txt

sudo pacman -S yay

error: yay: signature from "TNE <[email protected]>" is unknown trust
:: File /var/cache/pacman/pkg/yay-12.1.0-1-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n]

# get key ID D6C9442437365605
sudo pacman-key --list-sigs TNE

# manually sign key
sudo pacman-key --recv-key D6C9442437365605 --keyserver keyserver.ubuntu.com
sudo pacman-key --lsign-key D6C9442437365605

error: tensorflow-opt-cuda: signature from "Sven-Hendrik Haase <[email protected]>" is invalid
:: File /var/cache/pacman/pkg/tensorflow-opt-cuda-2.15.0-4-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] n
error: failed to commit transaction (invalid or corrupted package)
Errors occurred, no packages were upgraded.

pacman-key -v /var/cache/pacman/pkg/tensorflow-opt-cuda-2.15.0-4-x86_64.pkg.tar.zst.sig --verbose                                         127 ✘ 
==> Checking /var/cache/pacman/pkg/tensorflow-opt-cuda-2.15.0-4-x86_64.pkg.tar.zst.sig... (detached)
gpg: Signature made Friday, December 01, 2023 PM04:53:50 HKT
gpg:                using RSA key 8FC15A064950A99DD1BD14DD39E4B877E62EB91

pacman-key --list-keys 8FC15A064950A99DD1BD14DD39E4B877E62EB915                                                                             1 ✘ 
gpg: Note: trustdb not writable
pub   rsa4096 2011-09-10 [SC]
      8FC15A064950A99DD1BD14DD39E4B877E62EB915
uid           [  full  ] Sven-Hendrik Haase <[email protected]>
uid           [  full  ] Sven-Hendrik Haase <[email protected]>
uid           [  full  ] Sven-Hendrik Haase <[email protected]>

sudo pacman-key --recv-key  8FC15A064950A99DD1BD14DD39E4B877E62EB915                                                                          ✔ 
gpg: key 39E4B877E62EB915: 1 duplicate signature removed
gpg: key 39E4B877E62EB915: "Sven-Hendrik Haase <[email protected]>" 3 signatures cleaned

sudo pacman-key --lsign-key  8FC15A064950A99DD1BD14DD39E4B877E62EB915                                                                         ✔ 
  -> Locally signed 1 keys.
==> Updating trust database...
gpg: next trustdb check due at 2024-01-21

Nothing of this helped this time with Tensorflow:

sudo rm -rf  /etc/pacman.d/gnupg
sudo pacman-key --init
sudo pacman-key --populate
sudo pacman-key --refresh-keys
sudo pacman -Syyu

Do you really have uninstall, update, reinstall?

sudo pacman -R tensorflow-opt-cuda python-tensorflow-opt-cuda python-keras
sudo pacman -Syu
sudo pacman -S tensorflow-opt-cuda python-tensorflow-opt-cuda python-keras

Hmm reinstall also fails:

error: tensorflow-opt-cuda: signature from "Sven-Hendrik Haase <[email protected]>" is invalid

🤔

OK - a Manjaro issue: https://forum.manjaro.org/t/tensorflow-opt-cuda-signature-error/153169/17

$ sudo rm -r /etc/pacman.d/gnupg
$ sudo pacman-key --init
$ sudo pacman-key --populate archlinux
$ sudo pacman -S archlinux-keyring