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I'm running putty on Windows 7, logging into a Ubuntu 14.04 machine running KDE. My login is successful, but each time I get the message "Can't open display" immediately after the welcome message and before the shell prompt. I'm not trying to use X on this connection, I just want a shell, but I'm concerned that the error message indicates a deeper problem in the way Ubuntu is configured.

For what it's worth, X11 forwarding is not enabled in Putty for this session configuration.

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  • do you have X server installed on your Windows?
    – Jakuje
    Commented Nov 4, 2015 at 8:22
  • Usually this sort of thing can be isolated to some program you are running in your shell initialization, e.g., .bashrc, and seen by turning on the shell trace (using "set -x").
    – Thomas Dickey
    Commented Nov 4, 2015 at 10:33
  • @ThomasDickey - The set -x did it. Somehow or other the line 'xrandr --output VGA1...' got added to my .profile. Not sure how I managed that, or when, but problem solved. Thanks very much for the help.
    – Ron Christie
    Commented Nov 4, 2015 at 18:34
  • @ThomasDickey - if you format your comment as an answer, I'll accept it. Not sure how to accept a comment if it's even possible.
    – Ron Christie
    Commented Nov 4, 2015 at 18:44

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Usually this sort of thing can be isolated to some program you are running in your shell initialization, e.g., .bashrc, and seen by turning on the shell trace (using "set -x").

Occasionally programs that you install will (helpfully) update your shell initialization if they are not designed to be installed as root, though more often it is just leftovers from testing new configurations.

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