Display top CPU processes Using htop

htop is a very competent interactive process viewer for the shell, providing all the functionality – and more – that the top utility does, in an easier and more intuitive way. htop provides easy-to-use menus for most operations and also has support for using a mouse.
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Put an unpacked .deb file back together Using dpkg-repack

dpkg-repack creates a .deb file out of a Debian package that has already been installed on your system. If any changes have been made to the package while it was unpacked (ie, files in /etc modified),the new package will inherit the changes.
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How to Reboot Your Debian,Ubuntu System only if all else fails

Staring at a crashed Gnome session, CTRL-ALT-BKSPC does nothing. ALT-CTRL-F1 won’t bring you to a terminal where you could cd to /etc/init.d and restart gdm.
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Playing encrypted DVDs in Ubuntu

The movie players provided in Ubuntu can play back unencrypted DVDs. However, many commercial DVDs are encrypted with a weak algorithm called Content Scrambling System (CSS).You can enable playback of encrypted DVDs with MPlayer, xine and Totem-xine by installing libdvdcss2.
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