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I think I have some corruption is /etc as my system will not boot,
I want to run fsck, but, if I run fsck on /etc I get a message saying the /dev/mapper-lv_root is mounted. I did a little poking around and thought I could unmount it with umount /dev/sda1, but, it still didn't work as it appears to have been remounted or something.
By will not boot I mean it will not boot all the way into the Fedora 18 graphical environment. It hangs up where it is saying waiting for Plymouth. This started after a kernel upgrade, but, I also noticed some errors when I powered off. It doesn't fully boot into the earlier kernels in the boot manager either. I thought it was a bug so I reported it to bugzilla and sent some log files, etc. but they said it was not a bug but probably a corrupted file system.
If I run vchange -ay /dev/mapper/VolGroup-lv_root from the command line while booted for a Pupply Linux live CD I get:
I would suggest using the Fedora installation CD/DVD and boot to rescue mode.
There is a bugzilla report for what seems like the same problem and after a bit of googling this was a suggested fix. Without seeing the same information you submitted I do not know the difference but hopefully it will work for you.