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Lethe is a Deep Freeze-like partition freezing software for Debian GNU/Linux and Lihuen GNU/Linux (May work on other Debian-based GNU/Linux distributions). Lethe makes the partitions behave like a Live CD: all changes made on the file system will not be saved on the disk but in RAM and when the system restarts, all the content saved in the previous session is "forgotten" and lost and the disk / partitions are restored to their original state.

Lethe is based on Rootaufs, originally written by Nicholas Schembri, to whom we have to thank for publishing the script under a GPL license and making this application possible.

Download Lethe (Ubuntu / Debian .deb file)

Before installing the above package, you need to run this command:
sudo apt-get install aufs-*

And then install Lethe:
dpkg -i lethe_0.1-3-rev200905141647.ubuntu_i386.deb

This modifies the initramfs image and the GRUB menu, passing a parameter to the kernel: aufs=tmpfs. If you do not want to boot the system in "forgetting" mode, simply remove that argument from the GRUB configuration file or when the system loads, press E in the GRUB menu.

To remove it from your GRUB menu, press ALT + F2 and type:
gksu gedit /boot/grub/menu.lst
and search for "aufs=tmpfs" and remove it, then save the file.