apt-get gpg error when i try to update

i have a librem14 running pureos, i keep getting error running apt-get update librem14@PureOS:~$ sudo apt update An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://repo.ivpn.net/stable/debian ./generic InRelease: Unknown error executing apt-key W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://brave-browser-apt-release.s3.brave.com stable InRelease: Unknown error executing apt-key W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://repo.pureos.net/pureos byzantium InRelease: Unknown error executing apt-key W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://repo.pureos.net/pureos byzantium-updates InRelease: Unknown error executing apt-key W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://repo.pureos.net/pureos byzantium-security InRelease: Unknown error executing apt-key anybody know the solution?