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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 ...


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I solved it!.. I change the one that launches the synaptic by replacing Exec = synaptic-pkexec in usr/share/applications/synaptic.desktop pkexec is the one that manages authentication when you open synaptic(that is the flaw) which it doesn't authenticate you even though your root password is correct. I replace it to gksu synaptic %u then, save ...


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you can try a couple of things: sudo apt-get install apt-xapian-index sudo update-apt-xapian-index -vf If that doesn't work you can try: sudo apt-get install --reinstall synaptic sudo dpkg-reconfigure synaptic Hopefully that will take care of your issues.


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LionHater's solution just cured the problem for my Ubuntu 16 64 bit Gnome. I tried reinstalling Synaptic first which did not cure the problem, but it is possible that needs to be done first, no way to tell at this point.


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If you did a clean installation of 16.04, then you won't find Ubuntu Software center. It was replaced by GNOME’s Software. http://www.omgubuntu.co.uk/2015/11/the-ubuntu-software-centre-is-being-replace-in-16-04-lts


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Add Respository to sources.list You'll need to replace the nickname below with what you are running. Note to replace the word trusty with whatever version lsb states Helper on ​http://www.postgresql.org/download/linux/ubuntu/ For trusty (14.04) sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt trusty-pgdg main" >> /etc/apt/sources.list' ...



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