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I've been using Ubuntu 12.04 installed on a USB ever since the release. Just today when I booted up, I see an error showing up at my splash screen saying

An error occurred while mounting /home

below the 5 dots giving me two choices.

Either press S to skip mounting, which is no good cause when I do, I see my log-in screen come up, I enter my password --PAUSE-- the log-in screen starts again, then again I enter my password --PAUSE-- the log-in screen shows up...and the history repeats on every attempt.

OR

Press M for manual recovery, and when I press it I see

Filesystem check or mount failed.
A maintenance shell will now be started.
CONTROL-D will terminate this shell and continue booting after re-trying
filesystem. Any further errors will be ignored
root@TUD:~# 

on black screen then I can use login mohd_arafat_hossain to log-in and then I see...

No directory, logging in with HOME=/
mohd_arafat_hossain@TUD:/$

I just want to recover my Ubuntu to the way it was before. Unfortunately I don't know how to by myself :(

HELP!!!

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