W zasadzie dobrze, tylko powienieneś jeszcze na koniec zastosować się do tej rady:
"If this option is used to create a journal on a mounted filesys-
tem, an immutable file, .journal, will be created in the top-
level directory of the filesystem, as it is the only safe way to
create the journal inode while the filesystem is mounted. While
the ext3 journal is visible, it is not safe to delete it, or
modify it while the filesystem is mounted; for this reason the
file is marked immutable. While checking unmounted filesystems,
e2fsck(

will automatically move .journal files to the invisi-
ble, reserved journal inode. For all filesystems except for the
root filesystem, this should happen automatically and naturally
during the next reboot cycle. Since the root filesystem is
mounted read-only, e2fsck(

must be run from a rescue floppy in
order to effect this transition."
Czyli zbootuj system z jakieś dyskietki ratunkowej/livecd (np. dysków instalacyjnych) i wydaj polecenie e2fsck na partycji której używasz jako "/".
Wojtek