On Tuesday 04 December 2018 07:26:54 pm Kate Draven wrote:
> Out of the blue I started getting this error msg.
> Using PCLOS 64bit
>
> Unable to mount this device.
> Potential reasons include:
> Improper device and/or user privilege level
> Corrupt data on storage device
> Technical details:
> org.freedesktop.UDisks2.Error.Failed: Error mounting /dev/sdk1
> at /media/Lexar: Command-line
> `mount -t "vfat" -o
> "uhelper=udisks2,nodev,nosuid,uid=0,gid=0,shortname=mixed,utf8=1,showexec,f
>lush,noatime,shortname=lower" "/dev/sdk1" "/media/Lexar"' exited with
> non-zero exit status 32: mount: /mnt/Lexar: /dev/sdk1 already mounted or
> mount point busy.
>
> It's random and sometimes suddenly goes away.
> I've tried it with a variety of USB sticks.

I've had "mount point busy" come from both an open shell and a file manager 
that's sitting on the mount point before.  It can also block user un-mounting 
as well (although I think root umount force un-mounts?).