Data type: `String`
Specifies a keyserver to provide the GPG key. Valid options: a string containing a domain name or a full URL (http://, https://,
-hkp:// or hkps://).
+hkp:// or hkps://). The hkps:// protocol is currently only supported on Ubuntu 18.04.
Default value: $apt::params::keyserver
Data type: `Pattern[/\A((hkp|hkps|http|https):\/\/)?([a-z\d])([a-z\d-]{0,61}\.)+[a-z\d]+(:\d{2,5})?$/]`
Specifies a keyserver to provide the GPG key. Valid options: a string containing a domain name or a full URL (http://, https://,
-hkp:// or hkps://).
+hkp:// or hkps://). The hkps:// protocol is currently only supported on Ubuntu 18.04.
Default value: $::apt::keyserver