When updating packages on the robot I get an error relating to husarion repository:
husarion@cseerosbot4:~$ sudo apt update
Hit:1 http://ppa.launchpad.net/aaeon-cm/5.4-upboard/ubuntu focal InRelease
Hit:2 https://download.docker.com/linux/ubuntu bionic InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:4 https://install.husarnet.com/deb all InRelease
Get:5 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Get:6 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Hit:7 http://packages.ros.org/ros/ubuntu focal InRelease
Get:8 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Err:4 https://install.husarnet.com/deb all InRelease
The following signatures were invalid: EXPKEYSIG 197D62F68A4C7BD6 Husarnet Authors <contact@husarnet.com>
Get:9 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [874 kB]
Get:10 http://security.ubuntu.com/ubuntu focal-security/main i386 Packages [284 kB]
Get:11 http://security.ubuntu.com/ubuntu focal-security/main Translation-en [168 kB]
Get:12 http://us.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [538 kB]
Get:13 http://security.ubuntu.com/ubuntu focal-security/main amd64 c-n-f Metadata [8,708 B]
Get:14 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [417 kB]
Get:15 http://security.ubuntu.com/ubuntu focal-security/restricted Translation-en [59.8 kB]
Get:16 http://security.ubuntu.com/ubuntu focal-security/universe i386 Packages [507 kB]
Get:17 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages [639 kB]
Get:18 http://security.ubuntu.com/ubuntu focal-security/universe Translation-en [102 kB]
Get:19 http://security.ubuntu.com/ubuntu focal-security/universe amd64 c-n-f Metadata [12.4 kB]
Get:20 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [1,222 kB]
Get:21 http://us.archive.ubuntu.com/ubuntu focal-updates/main Translation-en [261 kB]
Get:22 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 c-n-f Metadata [14.3 kB]
Get:23 http://us.archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [454 kB]
Get:24 http://us.archive.ubuntu.com/ubuntu focal-updates/restricted Translation-en [65.0 kB]
Get:25 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [855 kB]
Get:26 http://us.archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages [634 kB]
Get:27 http://us.archive.ubuntu.com/ubuntu focal-updates/universe Translation-en [182 kB]
Get:28 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 c-n-f Metadata [18.8 kB]
Fetched 7,644 kB in 7s (1,118 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
620 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: https://install.husarnet.com/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.
How do I fix this please?
Thank you.