My Kobo also mounts at /media/$USER/KOBOeReader, and the mount point doesn't exist before it's created. The problem is clearly the ownership of the created mountpoint:
drwxr-xr-x 16 root root 4.0K Dec 31 1969 KOBOeReader
There's no /etc/fstab entry for this mountpoint, and I haven't futzed with the systemd mount unit (and I don't recall seeing a script having futzed with it either). I also don't think I've done anything with gnome-disk-utility, though I'm less sure about that.
The relevant bits from syslog where it's mounting my ereader:
Code:
Jun 12 01:19:04 hostname kernel: [2453801.783537] usb 3-1: new high-speed USB device number 4 using xhci_hcd
Jun 12 01:19:04 hostname kernel: [2453801.937323] usb 3-1: New USB device found, idVendor=2237, idProduct=4232, bcdDevice= 4.01
Jun 12 01:19:04 hostname kernel: [2453801.937327] usb 3-1: New USB device strings: Mfr=3, Product=4, SerialNumber=5
Jun 12 01:19:04 hostname kernel: [2453801.937329] usb 3-1: Product: eReader-4.26.16704
Jun 12 01:19:04 hostname kernel: [2453801.937330] usb 3-1: Manufacturer: Kobo
Jun 12 01:19:04 hostname kernel: [2453801.937332] usb 3-1: SerialNumber: N87309W070170
Jun 12 01:19:04 hostname kernel: [2453801.938239] usb-storage 3-1:1.0: USB Mass Storage device detected
Jun 12 01:19:04 hostname kernel: [2453801.938391] scsi host6: usb-storage 3-1:1.0
Jun 12 01:19:04 hostname mtp-probe: checking bus 3, device 4: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-1"
Jun 12 01:19:04 hostname mtp-probe: bus: 3, device: 4 was not an MTP device
Jun 12 01:19:05 hostname mtp-probe: checking bus 3, device 4: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-1"
Jun 12 01:19:05 hostname mtp-probe: bus: 3, device: 4 was not an MTP device
Jun 12 01:19:05 hostname kernel: [2453802.959905] scsi 6:0:0:0: Direct-Access Linux File-Stor Gadget 0401 PQ: 0 ANSI: 2
Jun 12 01:19:05 hostname kernel: [2453802.960158] sd 6:0:0:0: Attached scsi generic sg1 type 0
Jun 12 01:19:05 hostname kernel: [2453802.964497] sd 6:0:0:0: Power-on or device reset occurred
Jun 12 01:19:05 hostname kernel: [2453802.964879] sd 6:0:0:0: [sdb] 14139389 512-byte logical blocks: (7.24 GB/6.74 GiB)
Jun 12 01:19:05 hostname kernel: [2453802.965153] sd 6:0:0:0: [sdb] Write Protect is off
Jun 12 01:19:05 hostname kernel: [2453802.965155] sd 6:0:0:0: [sdb] Mode Sense: 0f 00 00 00
Jun 12 01:19:05 hostname kernel: [2453802.965396] sd 6:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Jun 12 01:19:05 hostname kernel: [2453802.989366] sdb:
Jun 12 01:19:05 hostname kernel: [2453803.000125] sd 6:0:0:0: [sdb] Attached SCSI removable disk
Jun 12 01:19:06 hostname usbmount[1093713]: executing command: mount -tvfat -osync,noexec,nodev,noatime,nodiratime /dev/sdb /media/usb0
Jun 12 01:19:06 hostname kernel: [2453803.954561] FAT-fs (sdb): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
Jun 12 01:19:06 hostname usbmount[1093713]: executing command: run-parts /etc/usbmount/mount.d
Jun 12 01:19:06 hostname dbus-daemon[1279]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.84' (uid=1000 pid=3458 comm="/usr/bin/gnome-shell " label="unconfined")
Jun 12 01:19:06 hostname systemd[1]: Starting Hostname Service...
Jun 12 01:19:06 hostname systemd[1]: Finished Clean the /media/user/KOBOeReader mount point.
Jun 12 01:19:06 hostname udisksd[1329]: Mounted /dev/sdb at /media/user/KOBOeReader on behalf of uid 1000