System Update froze - UbuntuMATE 16-04

Sarunas Burdulis sarunas at
Fri Jun 22 13:17:43 UTC 2018

On 2018-06-21 16:27, Bret Busby wrote:
> On 22/06/2018, Colin Law <clanlaw at> wrote:
>> You can try unmounting the disc using
>> sudo umount /dev/sdb
>> If that completes then the system should recover, but I suspect it
>> will not complete because the disc is not operating correctly.  In
>> which case as far as I can see your only option is to unplug it.  In
>> fact if is malfunctioning it may be that the longer you leave it
>> connected with the system trying to access it the more likely it is
>> that it will fail completely and lose all your data, so the safest
>> thing may be to unplug it.
>> Colin
> "
> root at bret-Inspiron-580-UbuntuMATE:/home/bret# umount /dev/sdb1
> umount: /media/bret/hp hard drive1: target is busy
>         (In some cases useful info about processes that
>          use the device is found by lsof(8) or fuser(1).)

How about:

umount -l /dev/sdb1

From umount manual:

-l, --lazy   Lazy unmount.  Detach the filesystem from the file
hierarchy now, and clean up all references to this filesystem as soon as
it is not busy anymore.

Sarunas Burdulis
Systems Administrator, Dartmouth Mathematics

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