Seems to be like this issue: http://ubuntuforums.org/showthread.php?t=2155314 and I am also experiencing this. Only it happens only sometimes and a reboot fixes it.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gsettings-desktop-schemas in Ubuntu. https://bugs.launchpad.net/bugs/1401646 Title: Shortcuts bug ( When press the "Ctrl + Alt", window Minimized ) Status in gsettings-desktop-schemas package in Ubuntu: Confirmed Bug description: When I press the Ctrl+Alt, The window minimized! I changed the shortcut key from "Ctrl+Alt+0" to "Shift+Alt+g" and then, I deal with maximize behavior when "Ctrl+Alt" pressed. I try with this command : $ gsettings reset-recursively org.gnome.desktop.wm.keybindings But nothing has been changed. The attached file is the output of following coammand : $ gsettings list-recursively | grep org.gnome.desktop.wm.keybindings 1>/tmp/Seveas The filename inspired from "Seveas" nickname in the #ubuntu IRC channel, Since He/She helped me to overcome this problem :) ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: gsettings-desktop-schemas 3.10.1-0ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8 Uname: Linux 3.13.0-39-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.6 Architecture: amd64 CurrentDesktop: Unity Date: Thu Dec 11 22:52:05 2014 InstallationDate: Installed on 2014-10-23 (49 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) PackageArchitecture: all SourcePackage: gsettings-desktop-schemas UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gsettings-desktop-schemas/+bug/1401646/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp