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The issue I'm seeing is the following:
Err:3 https://build.openvpn.net/debian/openvpn/testing jammy InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8E6DA8B4E158C569
Hit:4 https://build.openvpn.net/debian/openvpn/stable jammy InRelease
Err:4 https://build.openvpn.net/debian/openvpn/stable jammy InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8E6DA8B4E158C569
Reading package lists... Done
W: GPG error: https://build.openvpn.net/debian/openvpn/testing jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8E6DA8B4E158C569
E: The repository 'http://build.openvpn.net/debian/openvpn/testing jammy 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.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://build.openvpn.net/debian/openvpn/stable jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8E6DA8B4E158C569
So now apt fails to work for ubuntu host.
https://community.openvpn.net/openvpn/wiki/OpenvpnSoftwareRepos?__cf_chl_jschl_tk__=5451bb087 c8d934c96a7a790bb306d05cfd0db1d-1595832520-0-ASIH1nR4L80NS1cXoQwX8SieLawBmsLChIk7KGEroAkagKmsGU hjVo9gX6MKJus8A9Sx3l8Kr6-6Ttm0dsPdudz7jS9c8QM97OpJ6laLLob3jRys8E1Utnuiq2pwZ snctFOYNzwfqxvyb_fJCrvwr2PgM8pKia3Ha2DZwANjthFrze-IFHTRVCPWopMmrshxr7uA7UaIMEEDqgOPVR2SOOdVJQyodCyc_ q6p8smnEYkoanVyc9vLr2zg8K6SREMmNY7yOvBaFlLTnL57ick hojPwFeBZ5U6ly1YyjjV7H9CcoUCcwHJSYnqtb_wGZb8dtA
Err:3 https://build.openvpn.net/debian/openvpn/testing jammy InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8E6DA8B4E158C569
Hit:4 https://build.openvpn.net/debian/openvpn/stable jammy InRelease
Err:4 https://build.openvpn.net/debian/openvpn/stable jammy InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8E6DA8B4E158C569
Reading package lists... Done
W: GPG error: https://build.openvpn.net/debian/openvpn/testing jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8E6DA8B4E158C569
E: The repository 'http://build.openvpn.net/debian/openvpn/testing jammy 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.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://build.openvpn.net/debian/openvpn/stable jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8E6DA8B4E158C569
So now apt fails to work for ubuntu host.
https://community.openvpn.net/openvpn/wiki/OpenvpnSoftwareRepos?__cf_chl_jschl_tk__=5451bb087 c8d934c96a7a790bb306d05cfd0db1d-1595832520-0-ASIH1nR4L80NS1cXoQwX8SieLawBmsLChIk7KGEroAkagKmsGU hjVo9gX6MKJus8A9Sx3l8Kr6-6Ttm0dsPdudz7jS9c8QM97OpJ6laLLob3jRys8E1Utnuiq2pwZ snctFOYNzwfqxvyb_fJCrvwr2PgM8pKia3Ha2DZwANjthFrze-IFHTRVCPWopMmrshxr7uA7UaIMEEDqgOPVR2SOOdVJQyodCyc_ q6p8smnEYkoanVyc9vLr2zg8K6SREMmNY7yOvBaFlLTnL57ick hojPwFeBZ5U6ly1YyjjV7H9CcoUCcwHJSYnqtb_wGZb8dtA