Thanks for your feedback. Because update-manager is a GUI application it needs an xserver and the environment variable DISPLAY determines how it should connect to that server. There is no DISPLAY set by default on a tty and update-manager is not intended to be launched from a tty unless you know what you are doing.
So I'm closing this report because it's not a bug in Ubuntu. Thanks.
Thanks for your feedback. Because update-manager is a GUI application it needs an xserver and the environment variable DISPLAY determines how it should connect to that server. There is no DISPLAY set by default on a tty and update-manager is not intended to be launched from a tty unless you know what you are doing.
So I'm closing this report because it's not a bug in Ubuntu. Thanks.