[...] O eject não demonstra nenhuma mensagem.
Também é necessário tentar obter alguma informação útil de forma dinâmica, vez que segundo seu relato o eject diretamente não está retornando nada.
Deixe inicialmente o hd externo desconectado.
Abra **duas** janelas de terminal usando o Ctrl T duplamente.
Na primeira janela faça o comando abaixo e deixe a janela aberta registrando o que acontecerá a seguir:
journalctl -f
Agora espete o hd externo na porta usb 3.0
O reconhecimento dele deverá aparecer nessa primeira janela aberta.
Uma vez reconhecido, vá para a segunda janela e faça o comando:
sudo eject /dev/sdx
Onde, novamente, x é a identificação concreta da unidade, possivelmente sdb1.
O log do comando irá aparecer na primeira janela do journalctl.
Com o mouse copie e cole essas saídas do journalctl da primeira janela e traga ao tópico o resultado.
Esse comando journalctl é dinâmico (modernamente substituto do tail -f) e irá mostrar o log dos eventos na medida em que eles ocorrem, então o que se quer ver é a caracterização dos eventos no log.
Vamos ver se assim obtemos alguma pista de informação útil.
Use as teclas Ctrl C para encerrar o processamento dinâmico do journalctl
journalctl -f
-- Logs begin at Wed 2017-09-20 12:12:06 -03. --
set 20 12:15:25 dexter-K84C unity-panel-ser[1560]: menus_destroyed: assertion 'IS_WINDOW_MENU(wm)' failed
set 20 12:15:25 dexter-K84C hud-service[1857]: QCoreApplication::postEvent: Unexpected null receiver
set 20 12:15:31 dexter-K84C unity-panel-ser[1560]: window_menu_model_new: assertion 'BAMF_IS_APPLICATION(app)' failed
set 20 12:15:31 dexter-K84C unity-panel-ser[1560]: track_menus: assertion 'IS_WINDOW_MENU(menus)' failed
set 20 12:15:37 dexter-K84C dbus-daemon[1090]: Activating via systemd: service name='org.gnome.Terminal' unit='gnome-terminal-server.service'
set 20 12:15:37 dexter-K84C systemd[1058]: Starting GNOME Terminal Server...
set 20 12:15:37 dexter-K84C dbus-daemon[1090]: Successfully activated service 'org.gnome.Terminal'
set 20 12:15:37 dexter-K84C systemd[1058]: Started GNOME Terminal Server.
set 20 12:15:38 dexter-K84C hud-service[1857]: void DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "Nenhuma interface “com.canonical.dbusmenu” no objeto no caminho /org/ayatana/bamf/window/79691782"
set 20 12:15:42 dexter-K84C systemd-timesyncd[533]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com).
set 20 12:15:52 dexter-K84C systemd-timesyncd[533]: Timed out waiting for reply from 91.189.89.198:123 (ntp.ubuntu.com).
set 20 12:15:59 dexter-K84C kernel: usb 4-1: new SuperSpeed USB device number 2 using xhci_hcd
set 20 12:15:59 dexter-K84C kernel: usb 4-1: New USB device found, idVendor=0480, idProduct=a00e
set 20 12:15:59 dexter-K84C kernel: usb 4-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
set 20 12:15:59 dexter-K84C kernel: usb 4-1: Product: External USB 3.0
set 20 12:15:59 dexter-K84C kernel: usb 4-1: Manufacturer: TOSHIBA
set 20 12:15:59 dexter-K84C kernel: usb 4-1: SerialNumber: 20140310006759F
set 20 12:15:59 dexter-K84C mtp-probe[2553]: checking bus 4, device 2: "/sys/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb4/4-1"
set 20 12:15:59 dexter-K84C mtp-probe[2553]: bus: 4, device: 2 was not an MTP device
set 20 12:15:59 dexter-K84C kernel: usb-storage 4-1:1.0: USB Mass Storage device detected
set 20 12:15:59 dexter-K84C kernel: scsi host6: usb-storage 4-1:1.0
set 20 12:15:59 dexter-K84C kernel: usbcore: registered new interface driver usb-storage
set 20 12:15:59 dexter-K84C kernel: usbcore: registered new interface driver uas
set 20 12:16:00 dexter-K84C kernel: scsi 6:0:0:0: Direct-Access TOSHIBA External USB 3.0 0 PQ: 0 ANSI: 6
set 20 12:16:00 dexter-K84C kernel: sd 6:0:0:0: Attached scsi generic sg2 type 0
set 20 12:16:02 dexter-K84C kernel: sd 6:0:0:0: [sdb] 1953525168 512-byte logical blocks: (1.00 também/932 GiB)
set 20 12:16:02 dexter-K84C kernel: sd 6:0:0:0: [sdb] Write Protect is off
set 20 12:16:02 dexter-K84C kernel: sd 6:0:0:0: [sdb] Mode Sense: 43 00 00 00
set 20 12:16:02 dexter-K84C kernel: sd 6:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
set 20 12:16:02 dexter-K84C kernel: sdb: sdb1
set 20 12:16:02 dexter-K84C kernel: sd 6:0:0:0: [sdb] Attached SCSI disk
set 20 12:16:02 dexter-K84C systemd-timesyncd[533]: Timed out waiting for reply from 91.189.89.199:123 (ntp.ubuntu.com).
set 20 12:16:03 dexter-K84C ntfs-3g[2600]: Version 2016.2.22AR.1 integrated FUSE 28
set 20 12:16:03 dexter-K84C ntfs-3g[2600]: Mounted /dev/sdb1 (Read-Write, label "PABLO 1TB", NTFS 3.1)
set 20 12:16:03 dexter-K84C ntfs-3g[2600]: Cmdline options: rw,nodev,nosuid,uid=1000,gid=1000,uhelper=udisks2
set 20 12:16:03 dexter-K84C ntfs-3g[2600]: Mount options: rw,nodev,nosuid,uhelper=udisks2,allow_other,nonempty,relatime,default_permissions,fsname=/dev/sdb1,blkdev,blksize=4096
set 20 12:16:03 dexter-K84C ntfs-3g[2600]: Global ownership and permissions enforced, configuration type 7
set 20 12:16:03 dexter-K84C udisksd[1669]: Mounted /dev/sdb1 at /media/dexter/PABLO 1TB on behalf of uid 1000
set 20 12:16:04 dexter-K84C dbus[703]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service'
set 20 12:16:04 dexter-K84C nautilus[2605]: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed
set 20 12:16:04 dexter-K84C nautilus[2605]: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed
set 20 12:16:04 dexter-K84C systemd[1]: Starting Hostname Service...
set 20 12:16:04 dexter-K84C hud-service[1857]: void DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "Nenhuma interface “com.canonical.dbusmenu” no objeto no caminho /org/ayatana/bamf/window/37749363"
set 20 12:16:04 dexter-K84C dbus[703]: [system] Successfully activated service 'org.freedesktop.hostname1'
set 20 12:16:04 dexter-K84C systemd[1]: Started Hostname Service.
set 20 12:16:04 dexter-K84C nautilus[1630]: Called "net usershare info" but it failed: Falha ao executar processo filho “net” (Arquivo ou diretório não encontrado)
set 20 12:16:23 dexter-K84C sudo[2615]: dexter : TTY=pts/1 ; PWD=/home/dexter ; USER=root ; COMMAND=/usr/bin/eject /dev/sdb1
set 20 12:16:23 dexter-K84C sudo[2615]: pam_unix(sudo:session): session opened for user root by (uid=0)
set 20 12:16:23 dexter-K84C udisksd[1669]: Cleaning up mount point /media/dexter/PABLO 1TB (device 8:17 is not mounted)
set 20 12:16:23 dexter-K84C ntfs-3g[2600]: Unmounting /dev/sdb1 (PABLO 1TB)
set 20 12:16:23 dexter-K84C sudo[2615]: pam_unix(sudo:session): session closed for user root
set 20 12:16:29 dexter-K84C repowerd[768]: UPowerPowerSourceAndLid: change_device(/org/freedesktop/UPower/devices/battery_BAT0), type=battery, is_present=1, state=charging, percentage=64.00, temperature=0.00
Após isso quando clico com botão direito do mouse na unidade e solicito remover com segurança aparece o seguinte abaixo:
set 20 12:17:38 dexter-K84C udisksd[1669]: Successfully sent SCSI command SYNCHRONIZE CACHE to /dev/sdb
set 20 12:17:38 dexter-K84C udisksd[1669]: Successfully sent SCSI command START STOP UNIT to /dev/sdb
set 20 12:17:38 dexter-K84C kernel: sd 6:0:0:0: [sdb] Synchronizing SCSI cache
set 20 12:17:38 dexter-K84C udisksd[1669]: Powered off /dev/sdb - successfully wrote to sysfs path /sys/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb4/4-1/remove
set 20 12:17:38 dexter-K84C kernel: usb 4-1: USB disconnect, device number 2
set 20 12:17:38 dexter-K84C kernel: xhci_hcd 0000:03:00.0: Stop endpoint command completion for disabled slot 1
set 20 12:17:39 dexter-K84C kernel: usb 4-1: new SuperSpeed USB device number 3 using xhci_hcd
set 20 12:17:39 dexter-K84C kernel: usb 4-1: New USB device found, idVendor=0480, idProduct=a00e
set 20 12:17:39 dexter-K84C kernel: usb 4-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
set 20 12:17:39 dexter-K84C kernel: usb 4-1: Product: External USB 3.0
set 20 12:17:39 dexter-K84C kernel: usb 4-1: Manufacturer: TOSHIBA
set 20 12:17:39 dexter-K84C kernel: usb 4-1: SerialNumber: 20140310006759F
set 20 12:17:39 dexter-K84C kernel: usb-storage 4-1:1.0: USB Mass Storage device detected
set 20 12:17:39 dexter-K84C kernel: scsi host6: usb-storage 4-1:1.0
set 20 12:17:39 dexter-K84C mtp-probe[2670]: checking bus 4, device 3: "/sys/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/usb4/4-1"
set 20 12:17:39 dexter-K84C mtp-probe[2670]: bus: 4, device: 3 was not an MTP device
set 20 12:17:40 dexter-K84C kernel: scsi 6:0:0:0: Direct-Access TOSHIBA External USB 3.0 0 PQ: 0 ANSI: 6
set 20 12:17:40 dexter-K84C kernel: sd 6:0:0:0: Attached scsi generic sg2 type 0
set 20 12:17:40 dexter-K84C kernel: sd 6:0:0:0: [sdb] 1953525168 512-byte logical blocks: (1.00 também/932 GiB)
set 20 12:17:40 dexter-K84C kernel: sd 6:0:0:0: [sdb] Write Protect is off
set 20 12:17:40 dexter-K84C kernel: sd 6:0:0:0: [sdb] Mode Sense: 43 00 00 00
set 20 12:17:40 dexter-K84C kernel: sd 6:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
set 20 12:17:42 dexter-K84C kernel: sdb: sdb1
set 20 12:17:42 dexter-K84C kernel: sd 6:0:0:0: [sdb] Attached SCSI disk
set 20 12:17:44 dexter-K84C ntfs-3g[2704]: Version 2016.2.22AR.1 integrated FUSE 28
set 20 12:17:44 dexter-K84C ntfs-3g[2704]: Mounted /dev/sdb1 (Read-Write, label "PABLO 1TB", NTFS 3.1)
set 20 12:17:44 dexter-K84C ntfs-3g[2704]: Cmdline options: rw,nodev,nosuid,uid=1000,gid=1000,uhelper=udisks2
set 20 12:17:44 dexter-K84C ntfs-3g[2704]: Mount options: rw,nodev,nosuid,uhelper=udisks2,allow_other,nonempty,relatime,default_permissions,fsname=/dev/sdb1,blkdev,blksize=4096
set 20 12:17:44 dexter-K84C ntfs-3g[2704]: Global ownership and permissions enforced, configuration type 7
set 20 12:17:44 dexter-K84C udisksd[1669]: Mounted /dev/sdb1 at /media/dexter/PABLO 1TB on behalf of uid 1000
set 20 12:17:44 dexter-K84C dbus[703]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service'
set 20 12:17:44 dexter-K84C nautilus[2708]: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed
set 20 12:17:44 dexter-K84C nautilus[2708]: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed
set 20 12:17:44 dexter-K84C systemd[1]: Starting Hostname Service...
set 20 12:17:44 dexter-K84C hud-service[1857]: void DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "Nenhuma interface “com.canonical.dbusmenu” no objeto no caminho /org/ayatana/bamf/window/37749871"
set 20 12:17:44 dexter-K84C dbus[703]: [system] Successfully activated service 'org.freedesktop.hostname1'
set 20 12:17:44 dexter-K84C systemd[1]: Started Hostname Service.
set 20 12:18:21 dexter-K84C systemd-timesyncd[533]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com).
set 20 12:18:29 dexter-K84C repowerd[768]: UPowerPowerSourceAndLid: change_device(/org/freedesktop/UPower/devices/battery_BAT0), type=battery, is_present=1, state=charging, percentage=64.00, temperature=0.00
set 20 12:18:31 dexter-K84C systemd-timesyncd[533]: Timed out waiting for reply from 91.189.89.198:123 (ntp.ubuntu.com).
set 20 12:18:41 dexter-K84C systemd-timesyncd[533]: Timed out waiting for reply from 91.189.89.199:123 (ntp.ubuntu.com).
set 20 12:20:29 dexter-K84C repowerd[768]: UPowerPowerSourceAndLid: change_device(/org/freedesktop/UPower/devices/battery_BAT0), type=battery, is_present=1, state=charging, percentage=64.00, temperature=0.00