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When I open synaptic via launcher on gnome-panel, it opens and asks me for the password but if I enter the password, it says its wrong even though the password is correct and it used to work OK few days ago. If I open synaptic via terminal using sudo synaptic then it opens OK without any problem.

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What command does the launcher use to launch Synaptic? – Oxwivi Feb 22 '11 at 12:59
gksu --description /usr/share/applications/synaptic.desktop /usr/sbin/synaptic – HSS Feb 22 '11 at 13:03
I have solved it. Thanks for your concerns though. – HSS Feb 22 '11 at 13:03
up vote 2 down vote accepted

Ok, I have found whats wrong. I found the answer on ubuntuforums. Here is what to do.

press alt+f2 and run gconf-editor now go to apps->gksu and tick the sudo-mode checkbox and thats it.

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Thanks, I was having the same issue. – jcollum Nov 24 '11 at 2:45

The answer above is correct. But if the launcher that launches your synaptic is pkexec, you can change it by editing the synaptic.desktop on /usr/share/applications folder and change the Exec= synaptic-pkexec command to Exec= gksu synaptic %u then save it. By pressing ALT + F2, run gconf-editor , go to apps and gksu mark sudo-mode. That may do.

You can also see my answers " in this link "

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