I uninstalled Microsoft Edge Beta after getting errors. Used the software center to remove the file. It was removed successfully. When using the command "sudo apt update" getting the following error.
~$ sudo apt update
Hit:1 http://in.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://in.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:3 http://in.archive.ubuntu.com/ubuntu focal-backports InRelease
Get:4 https://packages.microsoft.com/repos/edge stable InRelease [7,343 B]
Hit:5 https://dl.google.com/linux/chrome/deb stable InRelease
Err:4 https://packages.microsoft.com/repos/edge stable InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EB3E94ADBE1229CF
Get:6 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Reading package lists... Done
W: GPG error: https://packages.microsoft.com/repos/edge stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EB3E94ADBE1229CF
E: The repository 'https://packages.microsoft.com/repos/edge stable 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.
How to remove the errors? any suggestion would be of great help.