A few weeks ago I installed OS X yosemite.I did it on the standard partition, but I had a dual-boot with ubuntu. I realised that the ubuntu boot was gone so I tried to redo it. But in disk utility, when i tried to make Macintosh HD smaller it gave a "Error: -69803: Couldn't modify partition map because file system verification failed "
How do I fix this, not just for dual booting but resizing partitions?
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