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When I log into gnome in Ubuntu 12.04, I can type the following on the command line to open a pdf:

evince mypdf.pdf

However, the following does not work.

su 
evince mypdf.pdf

That gives the following error:

(evince:1368): EggSMClient-WARNING **: Failed to connect to the session manager: None of the authentication protocols specified are supported


               ** (evince:1368): WARNING **: The connection is closed
                                 No protocol specified
                                 No protocol specified
                                 Cannot parse arguments: Cannot open display:

How can I fix it so that changing users on the command line does not break GUI applications?

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  • Have you checked out this related Q&A?
    – Glutanimate
    Apr 11, 2013 at 22:26
  • Search for it, but did not find it. Looking at it now.
    – merlin2011
    Apr 11, 2013 at 22:41
  • The answers to that question are not quite what I am looking for because, they only allow one to run an application as root. I would like to be able to run application as another (network) user.
    – merlin2011
    Apr 11, 2013 at 22:45
  • Also, in the root case, is there a way to su to a root shell and run applications without prepending everything with gksu?
    – merlin2011
    Apr 11, 2013 at 22:46
  • I am sorry, but I won't be able to help you. I really don't know too much about account management. I would advise you to update your post with these new questions and details. That way your post will be bumped and other user will be able to help you better.
    – Glutanimate
    Apr 12, 2013 at 0:48

1 Answer 1

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2

Generally speaking you use gksu

gksu evince mypdf.pdf

See https://help.ubuntu.com/community/RootSudo#Graphical_sudo

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