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Some filesystems fall back silently to read-only if there are problems such a dirty filesystem and an unrecoverable journal. Almost all conversions involve writing to the root filesystem, so these will inevitably fail later on with a strange error message. Test the root filesystem is writable by creating and deleting a temporary file, and if the creation fails then give better diagnostics.

...root filesystem, so these will > inevitably fail later on with a strange error message. > > Test the root filesystem is writable by creating and deleting a > temporary file, and if the creation fails then give better > diagnostics. Another possibility here could be to use the "norecover" mount option. -- Pino Toscano