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I saw this problem on different machines after upgrading from 12.04 to 14.04. To fix I had to issue sudo pam-auth-update --force Relevant bug: https://bugs.launchpad.net/ubuntu/+source/policykit-desktop-privileges/+bug/1240336


There is an option for that in KDE's systemsettings, in Application Appearence > Style > Fine Tuning


If you have Xubuntu 15.04 (xfce 4.12) you can make panel to be inteligent hided


Open up the hidden file named .gtkrc-2.0 in your home directory with any text editor you want. If the file doesn’t exist, create it. If you want to change the background color of the menu window add something like this: style "darkback" { bg[NORMAL] = "#404040" bg[ACTIVE] = "#606060" bg[PRELIGHT] = "#808080" } widget "whiskermenu-window*" ...


Uninstall KDE related things. Then delete folders gtk-2.0 and gtk-3.0 inside ~/.config: ~/.config/gtk-2.0 ~/.config/gtk-3.0 Then to reset Unity run: dconf reset -f /org/compiz/ setsid unity


Open the grub file by: sudo gedit /etc/default/grub and change the following line: GRUB_HIDDEN_TIMEOUT_QUIET=false to: GRUB_HIDDEN_TIMEOUT_QUIET=true Save and exit Run sudo update-grub

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