이 옵션은 삭제 된 것으로 보입니다. 우분투 맨 을위한은 fstab당신이 선택하면이 텍스트가 포함 14.04 LTS 상단을 :

The  mountall(8)  program  that  mounts  filesystem  during  boot  also
 recognises additional options that the ordinary mount(8) tool does not.
These  are:  ``bootwait''  which  can  be applied to remote filesystems
mounted outside of /usr or /var, without which  mountall(8)  would  not
hold up the boot for these; ``nobootwait'' which can be applied to non-
remote filesystems to explicitly instruct mountall(8) not  to  hold  up
the boot for them; ``optional'' which causes the entry to be ignored if
the filesystem type is not known  at  boot  time;  and  ``showthrough''
which  permits  a mountpoint to be mounted before its parent mountpoint
(this latter should be used carefully, as it can cause boot hangs).

상단 에서 16.04 를 선택하면 표시되는 페이지 버전 에이 단락이 없습니다 .

답변

   nofail
       With nofail, this mount will be only wanted, not required, by
       local-fs.target or remote-fs.target. This means that the boot will
       continue even if this mount point is not mounted successfully.

   nofail
       With nofail, this mount will be only wanted, not required, by
       local-fs.target or remote-fs.target. This means that the boot will
       continue even if this mount point is not mounted successfully.
   x-systemd.device-timeout=
       Configure how long systemd should wait for a device to show up
       before giving up on an entry from /etc/fstab. Specify a time in
       seconds or explicitly append a unit such as "s", "min", "h", "ms".