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In Linux Mint 17, when I try to open Synaptic Package Manager or Software Manager from the gui, the popup appears to enter my password. Yet when I enter it correctly, nothing happens; neither window opens. When I run synaptic from terminal, this is the output:

user@hostname ~ $ sudo synaptic
[sudo] password for user: 
No protocol specified

** (synaptic:4516): WARNING **: Could not open X display
No protocol specified
error: XDG_RUNTIME_DIR not set in the environment.

(synaptic:4516): Gtk-WARNING **: cannot open display: :0

Does anybody know how I could fix this?

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