Seems like it's just an issue of "have you tried turning it off and on again":
Nov 30 08:54:25 bnasws02 kernel: [17446.546905] usb 1-8: new high-speed USB device number 6 using xhci_hcd Nov 30 08:54:25 bnasws02 kernel: [17446.689489] usb 1-8: New USB device found, idVendor=058f, idProduct=6366 Nov 30 08:54:25 bnasws02 kernel: [17446.689491] usb 1-8: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Nov 30 08:54:25 bnasws02 kernel: [17446.689492] usb 1-8: Product: Flash Card Reader/Writer Nov 30 08:54:25 bnasws02 kernel: [17446.689493] usb 1-8: Manufacturer: Generic Nov 30 08:54:25 bnasws02 kernel: [17446.689494] usb 1-8: SerialNumber: 058F63666485 Nov 30 08:54:25 bnasws02 kernel: [17446.689936] usb-storage 1-8:1.0: USB Mass Storage device detected Nov 30 08:54:25 bnasws02 kernel: [17446.690043] scsi host4: usb-storage 1-8:1.0 Nov 30 08:54:25 bnasws02 mtp-probe: checking bus 1, device 6: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-8" Nov 30 08:54:25 bnasws02 mtp-probe: bus: 1, device: 6 was not an MTP device Nov 30 08:54:26 bnasws02 kernel: [17447.720553] scsi 4:0:0:0: Direct-Access Multiple Card Reader 1.00 PQ: 0 ANSI: 4 Nov 30 08:54:26 bnasws02 kernel: [17447.721271] sd 4:0:0:0: Attached scsi generic sg1 type 0 Nov 30 08:54:29 bnasws02 kernel: [17450.797969] sd 4:0:0:0: [sdb] Attached SCSI removable disk Nov 30 08:55:16 bnasws02 kernel: [17497.700513] usb 1-8: USB disconnect, device number 6 .... Nov 30 08:55:23 bnasws02 kernel: [17504.230075] usb 1-8: new high-speed USB device number 7 using xhci_hcd Nov 30 08:55:23 bnasws02 kernel: [17504.372672] usb 1-8: New USB device found, idVendor=058f, idProduct=6366 Nov 30 08:55:23 bnasws02 kernel: [17504.372674] usb 1-8: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Nov 30 08:55:23 bnasws02 kernel: [17504.372676] usb 1-8: Product: Flash Card Reader/Writer Nov 30 08:55:23 bnasws02 kernel: [17504.372677] usb 1-8: Manufacturer: Generic Nov 30 08:55:23 bnasws02 kernel: [17504.372678] usb 1-8: SerialNumber: 058F63666485 Nov 30 08:55:23 bnasws02 kernel: [17504.373161] usb-storage 1-8:1.0: USB Mass Storage device detected Nov 30 08:55:23 bnasws02 kernel: [17504.373266] scsi host4: usb-storage 1-8:1.0 Nov 30 08:55:23 bnasws02 mtp-probe: checking bus 1, device 7: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-8" Nov 30 08:55:23 bnasws02 mtp-probe: bus: 1, device: 7 was not an MTP device Nov 30 08:55:24 bnasws02 kernel: [17505.387726] scsi 4:0:0:0: Direct-Access Multiple Card Reader 1.00 PQ: 0 ANSI: 4 Nov 30 08:55:24 bnasws02 kernel: [17505.388397] sd 4:0:0:0: Attached scsi generic sg1 type 0 Nov 30 08:55:24 bnasws02 kernel: [17505.848103] sd 4:0:0:0: [sdb] 124735488 512-byte logical blocks: (63.9 GB/59.5 GiB) Nov 30 08:55:24 bnasws02 kernel: [17505.850019] sd 4:0:0:0: [sdb] Write Protect is off Nov 30 08:55:24 bnasws02 kernel: [17505.850021] sd 4:0:0:0: [sdb] Mode Sense: 23 00 00 00 Nov 30 08:55:24 bnasws02 kernel: [17505.851955] sd 4:0:0:0: [sdb] Write cache: disabled, read cache: disabled, doesn't support DPO or FUA Nov 30 08:55:24 bnasws02 kernel: [17505.870801] sdb: sdb1 Nov 30 08:55:24 bnasws02 kernel: [17505.875682] sd 4:0:0:0: [sdb] Attached SCSI removable disk Nov 30 08:55:24 bnasws02 mount.exfat: volume was not unmounted cleanly Nov 30 08:55:24 bnasws02 udisksd[1908]: Mounted /dev/sdb1 at /media/sebastian/497A-63F4 on behalf of uid 1000 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1644981 Title: ExFAT Formatted SD Cards not mounted Status in linux package in Ubuntu: Confirmed Bug description: ExFAT formatted SD cards aren't mounted ob Ubuntu 16.04. The cards work perfectly on 12.04, 14.04 and Windows. Nov 26 11:21:22 bnasws02 kernel: [93798.228489] usb 1-8: new high-speed USB device number 7 using xhci_hcd Nov 26 11:21:22 bnasws02 kernel: [93798.358675] usb 1-8: New USB device found, idVendor=058f, idProduct=6366 Nov 26 11:21:22 bnasws02 kernel: [93798.358678] usb 1-8: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Nov 26 11:21:22 bnasws02 kernel: [93798.358680] usb 1-8: Product: Flash Card Reader/Writer Nov 26 11:21:22 bnasws02 kernel: [93798.358682] usb 1-8: Manufacturer: Generic Nov 26 11:21:22 bnasws02 kernel: [93798.358683] usb 1-8: SerialNumber: 058F63666485 Nov 26 11:21:22 bnasws02 kernel: [93798.359894] usb-storage 1-8:1.0: USB Mass Storage device detected Nov 26 11:21:22 bnasws02 kernel: [93798.359950] scsi host7: usb-storage 1-8:1.0 Nov 26 11:21:22 bnasws02 mtp-probe: checking bus 1, device 7: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-8" Nov 26 11:21:22 bnasws02 mtp-probe: bus: 1, device: 7 was not an MTP device Nov 26 11:21:23 bnasws02 kernel: [93799.357754] scsi 7:0:0:0: Direct-Access Multiple Card Reader 1.00 PQ: 0 ANSI: 4 Nov 26 11:21:23 bnasws02 kernel: [93799.358491] sd 7:0:0:0: Attached scsi generic sg1 type 0 Nov 26 11:21:27 bnasws02 kernel: [93802.408280] sd 7:0:0:0: [sdb] Attached SCSI removable disk ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-generic 4.4.0.47.50 ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24 Uname: Linux 4.4.0-47-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: sebastian 2240 F.... pulseaudio /dev/snd/controlC1: sebastian 2240 F.... pulseaudio CurrentDesktop: GNOME Date: Sat Nov 26 11:22:03 2016 HibernationDevice: RESUME=UUID=bdba64aa-c323-4ba7-a32d-bc49a2716cc7 InstallationDate: Installed on 2015-08-06 (477 days ago) InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 007: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader Bus 001 Device 003: ID 064e:9700 Suyin Corp. Asus Integrated Webcam Bus 001 Device 002: ID 8087:0a2a Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: ASUSTeK COMPUTER INC. UX305LA ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-47-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-47-generic N/A linux-backports-modules-4.4.0-47-generic N/A linux-firmware 1.157.5 SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-11-21 (4 days ago) dmi.bios.date: 07/06/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: UX305LA.204 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UX305LA dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: ATN12345678901234567 dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX305LA.204:bd07/06/2015:svnASUSTeKCOMPUTERINC.:pnUX305LA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX305LA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.name: UX305LA dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. 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