Solve Proxmox CloudLinux Kernel Care GPG Error

apt-key adv --keyserver subkeys.pgp.net --recv-key E58FE9B3FE3B0470525159BD6DC3D600CDEF74BB
 apt-get install dirmngr

 

UPDATE: 

This issue may be caused by a buggy package installation script causing incorrect repositories to be added to the software sources repository list. If after troubleshooting the issue remains unresolved contact your vendors by opening a support ticket with the error details.

 

Other error message:

gpg: failed to start the dirmngr ‘/usr/bin/dirmngr’: No such file or directory

 

References:

https://unix.stackexchange.com/questions/401547/gpg-keyserver-receive-failed-no-dirmngr

https://serverfault.com/questions/337278/debian-how-can-i-securely-get-debian-archive-keyring-so-that-i-can-do-an-apt-g