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lock-up recovery procedure after the screen lock timeout

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http://askubuntu.com – What is the procedure for resolving Ubuntu lock-ups? After the timeout and associated screen lock, wake-up activity such as mouse movement or key presses -- I usually use the harmless shift key -- fail to bring up the OS login prompt. Sometimes the desktop wallpaper will be displayed; sometimes the screen will be black. In either case, the cursor is visible and movable but hovering it on the left to get a Launcher bar will not result in a Launcher bar being displayed and hovering it in the upper right corner will not result in a drop down menu being displayed. This has been observed on (HowTos)