Recover password under Ubuntu
If you forgot you password for your ubuntu system you can recover using the following steps:
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1Turn your computer on.
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1Press ESC at the grub prompt.
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1Press e for edit.
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1Highlight the line that begins kernel ………, press e
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1Go to the very end of the line, add rw init=/bin/bash
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1press enter, then press b to boot your system.
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1Your system will boot up to a passwordless root shell.
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1Type in passwd username
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1Set your password.
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1Type in reboot
Oppure se è implementata usare la shell di recovery, e quando esce la lista con le opzioni selezionare la shell di root e poi usare il comando passwd
http://www.soft-land.org/cgi-bin/doc.pl?host=www.soft-land.org&doc=articoli/artlb01
http://www.ubuntugeek.com/how-to-recover-password-under-ubuntu.html
http://www.chimerarevo.com/2010/07/10/ubuntu-come-ripristinare-la-password-dimenticata/