Comment 7 for bug 1784454

This bug was fixed in the package systemd - 229-4ubuntu21.4

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systemd (229-4ubuntu21.4) xenial; urgency=medium

  * debian/extra/start-udev: test that sync parameters file is writable, before
    writing to it. On old kernels (e.g. v4.4) the file is available but is
    read-only, thus writing to it causes init to fail and thus raise a kernel
    panic. As an extra caution ignore failures to write into that file anyway,
    since synchronous scsi probing is not critical enough to prevent starting
    d-i. LP: #1784454

 -- Dimitri John Ledkov <email address hidden> Mon, 30 Jul 2018 19:58:15 +0100