I followed below link to upgrade the L4T from r32.2.1 to r32.4 on AGX Xavier.
However, ‘apt update’ got some error.
Err:10 https://repo.download.nvidia.com/jetson/common r32.4 InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 0D296FFB880FB004
Err:11 https://repo.download.nvidia.com/jetson/t194 r32.4 InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 0D296FFB880FB004
xavier@xavier-desktop:~$ sudo apt update
Get:1 file:/var/cuda-repo-10-0-local-10.0.326 InRelease
Ign:1 file:/var/cuda-repo-10-0-local-10.0.326 InRelease
Get:2 file:/var/visionworks-repo InRelease
Ign:2 file:/var/visionworks-repo InRelease
Get:3 file:/var/visionworks-sfm-repo InRelease
Ign:3 file:/var/visionworks-sfm-repo InRelease
Get:4 file:/var/visionworks-tracking-repo InRelease
Ign:4 file:/var/visionworks-tracking-repo InRelease
Get:5 file:/var/cuda-repo-10-0-local-10.0.326 Release [574 B]
Get:6 file:/var/visionworks-repo Release [1,999 B]
Get:7 file:/var/visionworks-sfm-repo Release [2,003 B]
Get:5 file:/var/cuda-repo-10-0-local-10.0.326 Release [574 B]
Get:8 file:/var/visionworks-tracking-repo Release [2,008 B]
Get:6 file:/var/visionworks-repo Release [1,999 B]
Get:7 file:/var/visionworks-sfm-repo Release [2,003 B]
Get:8 file:/var/visionworks-tracking-repo Release [2,008 B]
Get:10 https://repo.download.nvidia.com/jetson/common r32.4 InRelease [2,552 B]
Get:11 https://repo.download.nvidia.com/jetson/t194 r32.4 InRelease [2,559 B]
Hit:12 Index of /ubuntu-ports bionic InRelease
Get:14 Index of /ubuntu-ports bionic-updates InRelease [88.7 kB]
Get:17 Index of /ubuntu-ports bionic-backports InRelease [74.6 kB]
Get:18 Index of /ubuntu-ports bionic-security InRelease [88.7 kB]
Err:10 https://repo.download.nvidia.com/jetson/common r32.4 InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 0D296FFB880FB004
Err:11 https://repo.download.nvidia.com/jetson/t194 r32.4 InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 0D296FFB880FB004
Get:19 Index of /ubuntu-ports bionic-updates/main arm64 Packages [678 kB]
Get:20 Index of /ubuntu-ports bionic-updates/main arm64 DEP-11 Metadata [301 kB]
Get:21 Index of /ubuntu-ports bionic-updates/universe arm64 Packages [959 kB]
Get:22 Index of /ubuntu-ports bionic-updates/universe arm64 DEP-11 Metadata [274 kB]
Get:23 Index of /ubuntu-ports bionic-backports/universe arm64 DEP-11 Metadata [7,964 B]
Get:24 Index of /ubuntu-ports bionic-security/main arm64 Packages [471 kB]
Get:25 Index of /ubuntu-ports bionic-security/main Translation-en [236 kB]
Get:26 Index of /ubuntu-ports bionic-security/main arm64 DEP-11 Metadata [37.6 kB]
Get:27 Index of /ubuntu-ports bionic-security/universe arm64 Packages [593 kB]
Get:28 Index of /ubuntu-ports bionic-security/universe Translation-en [223 kB]
Get:29 Index of /ubuntu-ports bionic-security/universe arm64 DEP-11 Metadata [44.1 kB]
Reading package lists… Done
W: GPG error: https://repo.download.nvidia.com/jetson/common r32.4 InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 0D296FFB880FB004
E: The repository ‘https://repo.download.nvidia.com/jetson/common r32.4 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: GPG error: https://repo.download.nvidia.com/jetson/t194 r32.4 InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 0D296FFB880FB004
E: The repository ‘https://repo.download.nvidia.com/jetson/t194 r32.4 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.
I tried to fix the issue with below method, it failed with complaining keyserver receive failed: No data.
xavier@xavier-desktop:~$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0D296FFB880FB004
Executing: /tmp/apt-key-gpghome.KOCW0beMCs/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 0D296FFB880FB004
gpg: keyserver receive failed: No data
Did I miss anything?