• Cannot add dartware repository to Ubuntu 18.04.1

    Just went through an OS upgrade from Ubuntu Server 16.04.5 to 18.04.1

    Intermapper itself is running and operating fine.  As part of the upgrade process Ubuntu disables all 3rd party sources.  I've gone through the steps posted in the installation readme to add the dartware repository again.

    I know the dartware repository was using a weak key strength as it was always complaining on 16.04 already.  Now I cannot add it at all without getting verification errors:

    [email protected]:/etc/apt# curl --output dartware_public_key.asc -L http://www.intermapper.com/go.php?to=gpgkey
      % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                     Dload  Upload   Total   Spent    Left  Speed
    100   185  100   185    0     0   1045      0 --:--:-- --:--:-- --:--:--  1045
    100   279  100   279    0     0    680      0 --:--:-- --:--:-- --:--:--   680
      0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
    100  1712  100  1712    0     0   1764      0 --:--:-- --:--:-- --:--:--  1764
    [email protected]:/etc/apt# apt-key add dartware_public_key.asc
    OK
    [email protected]:/etc/apt# apt update
    <REMOVED many lines here>
    Reading package lists... Done
    W: GPG error: http://download.dartware.com/debian ./ Release: The following signatures were invalid: 4E876D4B2C0945F14BC165F6DF7BA8CA6ACACF42
    E: The repository 'http://download.dartware.com/debian ./ Release' 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.

    Just wondering if the apt-get method is still a supported feature for dartware/HelpSystems products?  I don't mind doing the manual upgrade method as I used  to do that.  Just found it more convenient to use Ubuntu's built-in update management ;)