I am duel-booting Ubuntu 12.04 and Windows 8. I was booted into Ubuntu when I lost power and now when I try to boot into Ubuntu it freezes on a black screen. However I can still boot into Windows just fine. When I boot into recovery mode I get the fallowing error:

There are differences between boot sector and its backup.

Differences: (offset: original/backup)

    65:01/00

    Not automatically fixing this

/dev/sda6 contains a file system with errors, check forced.

Checking disk drives for errors. This may take several minutes.

Press C to cancel all check in progress

/dev/sda1: 179 files, 7007/126976 clusters

/dev/sda6 Unattached inode 599991

/dev/sda6: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.

        (i.e., without -a or -p options)

mountall: fsck / [1183] terminated with statas 4

mountall: Filesystem has errors: /



Errors were found while checking the disk drive for /.

Press F to attempt to fix the errors, I to ignore, S to skip mounting, or M for manual recovery

I tried pressing 'F' to attempt to fix the errors but nothing happened. Actually I tried pressing all of the mentioned keys ('F', 'I', 'S', and 'M') all on different reboots but the computer was unresponsive.

I am new to Ubuntu and Linux in general so I don't exactly know where to start. Thanks in advance for any help.