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When I start synaptic package manager normally (Super-Synaptic), it asks for a password. When I enter password, nothing happens!

When I start synaptic form terminal using synaptic-pkexec, I get:

No protocol specified

** (synaptic:2760): WARNING **: Could not open X display
No protocol specified

(synaptic:2760): Gtk-WARNING **: cannot open display: :0

And I am back to the prompt.

When I start synaptic form terminal using sudo synaptic, it asks for sudo password in the terminal on entering it, it gives:

(synaptic:2721): IBUS-WARNING **: The owner of /home/..../ibus/bus is not root!

Then several messages like:

(synaptic:2842): Gtk-WARNING **: GtkNotebook 0x84c1128 is mapped but visible child GtkLabel 0x8693970 is not mapped

And synaptic starts with administrative privileges.

What is happening? How do I get the normal behaviour (Super-synaptics-password) sequence back?

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I recently had issue like this, but I stumbled upon a forum which said to try these;

grep 'pam_xauth.so' /etc/pam.d/*  | awk -F ":" '{ printf "%s\t(%s)\n", $2, $1}'

if that didn't work then you just set this into /etc/sudoers

Defaults env_keep=DISPLAY

logout and back in again and it should work.

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