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I'm running Linux Mint 17.2.

Here's what happens when I try to mount an external USB drive:

Error mounting system-managed device /dev/sdc1: Command-line `mount "/media/nick/MyPassportRed"' exited with non-zero exit status 21: mount: according to mtab, /dev/sdc1 is already mounted on /media/nick/MyPassportRed

 (udisks-error-quark, 0)

But it isn't mounted, and it's not in mtab:

nick-LenovoThinkServer% cat /etc/mtab
/dev/sda1 / ext4 rw,noatime,nodiratime,errors=remount-ro 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0
systemd /sys/fs/cgroup/systemd cgroup rw,noexec,nosuid,nodev,none,name=systemd 0 0
/dev/sdb1 /media/nick/PortableSSD ext4 rw,nosuid,nodev,uhelper=udisks2 0 0

Similarly, I cannot mount a network location with sshfs:

nick-LenovoThinkServer% sshfs 192.168.0.102:/ /mnt/Nick-MacBookAir
fuse: bad mount point `/mnt/Nick-MacBookAir': Transport endpoint is not connected

Running df:

nick-LenovoThinkServer% df
df: ‘/run/user/1000/gvfs’: Transport endpoint is not connected
df: ‘/mnt/Nick-MacBookAir’: Transport endpoint is not connected
Filesystem     1K-blocks      Used Available Use% Mounted on
udev            16401184         4  16401180   1% /dev
tmpfs            3283412      5076   3278336   1% /run
/dev/sda1      447676256 309264808 115647776  73% /
none                   4         0         4   0% /sys/fs/cgroup
tmpfs           16417060        12  16417048   1% /tmp
none                5120         0      5120   0% /run/lock
none            16417060     74620  16342440   1% /run/shm
none              102400        40    102360   1% /run/user
tmpfs           16417060        44  16417016   1% /var/tmp
/dev/sdb1      240232960  54234060 173772648  24% /media/nick/PortableSSD

Oddly enough, the sshfs mount shows up when I run the mount command, but the MyPassportRed USB drive doesn't:

nick-LenovoThinkServer% mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,relatime,size=16401184k,nr_inodes=4100296,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=3283412k,mode=755)
/dev/disk/by-uuid/0c8d68c5-084d-40a0-9d9a-9a007a555526 on / type ext4 (rw,noatime,nodiratime,errors=remount-ro,data=ordered)
none on /sys/fs/cgroup type tmpfs (rw,relatime,size=4k,mode=755)
none on /sys/fs/fuse/connections type fusectl (rw,relatime)
none on /sys/kernel/debug type debugfs (rw,relatime)
none on /sys/kernel/security type securityfs (rw,relatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noatime)
none on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
none on /run/shm type tmpfs (rw,nosuid,nodev,relatime)
none on /run/user type tmpfs (rw,nosuid,nodev,noexec,relatime,size=102400k,mode=755)
none on /sys/fs/pstore type pstore (rw,relatime)
tmpfs on /var/tmp type tmpfs (rw,nosuid,nodev,noatime)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,nosuid,nodev,noexec,relatime)
systemd on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,name=systemd)
gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)
/dev/sdb1 on /media/nick/PortableSSD type ext4 (rw,nosuid,nodev,relatime,stripe=8191,data=ordered)
192.168.0.102:/ on /mnt/Nick-MacBookAir type fuse.sshfs (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)

Please. Any ideas?

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Normally, the error message

fuse: bad mount point `/mnt/Nick-MacBookAir': Transport endpoint is not connected

is due to the fact that the connection dropped at some point, but your system still keeps memory of the volume as if it were mounted, while it really is not. The other error message,

mount: according to mtab, /dev/sdc1 is already mounted on /media/nick/MyPassportRed

suggests exactly the same thing. What you need to do is, first, to kill the sshfs processes, to forcefully unmount the mount points,

  sudo umount -l /path/to/mount/points

and now restart sshfs. Keep in mind you can avoid this hassle if you use the reconnect option to sshfs: from the Manual,

-o reconnect reconnect to server

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