I'm afraid that this is not an ubiquity bug. It looks like your hard disk is dying, causing problems around the system. If I were you I would backup my data as soon as possible. Thanks for reporting this.
** Changed in: ubiquity (Ubuntu)
Status: Unconfirmed => Rejected
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`apt-get': No such file or directory was:Installer Crashed
https://launchpad.net/bugs/61598
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