Error with Sudo apt update

Hallo,
Hello,
I have a problem. When I run the command sudo apt update, I get this message:
Get:1 file:/var/cudnn-local-tegra-repo-ubuntu2004-8.6.0.166 InRelease [1,575 B]
Get:1 file:/var/cudnn-local-tegra-repo-ubuntu2004-8.6.0.166 InRelease [1,575 B]
Hit:2 Index of /ubuntu-ports focal InRelease
Hit:3 Index of /ubuntu-ports focal-updates InRelease
Hit:4 Index of /ubuntu-ports focal-backports InRelease
Hit:5 https://repo.download.nvidia.com/jetson/common r35.3 InRelease
Hit:6 Index of /ubuntu-ports focal-security InRelease
Hit:7 Index of linux/ubuntu/ focal InRelease
Hit:8 Index of /compute/cuda/repos/ubuntu2004/x86_64 InRelease
Hit:9 http://packages.ros.org/ros2/ubuntu focal InRelease
Hit:10 Index of /deb/ all InRelease
Hit:11 https://repo.download.nvidia.com/jetson/t234 r35.3 InRelease
Hit:12 Index of /ubuntu-toolchain-r/test/ubuntu focal InRelease
Err:10 Index of /deb/ all InRelease
The following signatures were invalid: EXPKEYSIG 197D62F68A4C7BD6 Husarnet Authors contact@husarnet.com
Reading package lists… Done
Building dependency tree
Reading state information… Done
3 packages can be upgraded. Run ‘apt list --upgradable’ to see them.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: Index of /deb/ all InRelease: The following signatures were invalid: EXPKEYSIG 197D62F68A4C7BD6 Husarnet Authors contact@husarnet.com
W: Failed to fetch https://install.husarnet.com/deb/dists/all/InRelease The following signatures were invalid: EXPKEYSIG 197D62F68A4C7BD6 Husarnet Authors contact@husarnet.com
W: Some index files failed to download. They have been ignored, or old ones used instead.

In the community, I searched for the same problem. Other users also had this issue earlier, but it was an old topic, and the solution did not work.
I would be glad if you could continue helping me with this problem.
Best Regard,
Sina

Hello @ssalimi,
The keys are probably expired, and the problem should be fixed within a few days.
The key update will most likely take place using the same commands as in the post about key update. For more information, please check https://community.husarnet.com for updates.