New answers tagged applet
It depends what you're using. If you are using gnome 3 for example, something along these lines would work: https://extensions.gnome.org/extension/154/gmail-notify/ There's also the Unity webapps that's an option. http://blog.canonical.com/2012/07/19/introducing-ubuntu-web-apps-setting-the-web-free-of-the-browser/ Just a few ideas you could look into. ...
I had the same problem on Lubuntu 14.04 after an upgrade. I tested parts of antiplex answer: killall nm-applet dbus-launch nm-applet seemed to help. So for me it was enough to go to Preferences --> Default applications for LX Session --> Autostart, uncheck Network and add dbus-launch nm-applet
In /etc/sudoers file add a line: %sudo ALL= NOPASSWD: /sbin/shutdown To edit /etc/sudoers file, run visudo command.
The easiest way for this without using sudo everytime is giving shutdown command special permissions, so that if the user runs shutdown it will run with root permissions for this do sudo chmod u+s /sbin/shutdown now the shutdown command won't need root everytime you issue the command and if you wan't to revert it you can always do sudo chmod u-s ...
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