I have the same problem. It was working fine until I did an update of kstars.
Here's my kernel log

Apr 25 22:25:47 hp-elite kernel: [   86.634417] aufs au_opts_verify:1623:dockerd[2778]: dirperm1 breaks the protection by the permission bits on the lower branch
Apr 25 22:27:07 hp-elite kernel: [  166.683503] usb 3-2: new full-speed USB device number 4 using xhci_hcd
Apr 25 22:27:07 hp-elite kernel: [  166.838512] usb 3-2: New USB device found, idVendor=0403, idProduct=6015
Apr 25 22:27:07 hp-elite kernel: [  166.838516] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Apr 25 22:27:07 hp-elite kernel: [  166.838518] usb 3-2: Product: FT230X Basic UART
Apr 25 22:27:07 hp-elite kernel: [  166.838520] usb 3-2: Manufacturer: FTDI
Apr 25 22:27:07 hp-elite kernel: [  166.838521] usb 3-2: SerialNumber: DN05ROJB
Apr 25 22:27:07 hp-elite kernel: [  166.841793] ftdi_sio 3-2:1.0: FTDI USB Serial Device converter detected
Apr 25 22:27:07 hp-elite kernel: [  166.841838] usb 3-2: Detected FT-X
Apr 25 22:27:07 hp-elite kernel: [  166.842245] usb 3-2: FTDI USB Serial Device converter now attached to ttyUSB1
Apr 25 22:27:07 hp-elite kernel: [  167.011484] usb 3-1.1: new high-speed USB device number 5 using xhci_hcd
Apr 25 22:27:07 hp-elite kernel: [  167.211601] usb 3-1.1: New USB device found, idVendor=20e7, idProduct=df31
Apr 25 22:27:07 hp-elite kernel: [  167.211605] usb 3-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
Apr 25 22:27:07 hp-elite kernel: [  167.535505] usb 3-1.3: new full-speed USB device number 6 using xhci_hcd
Apr 25 22:27:08 hp-elite kernel: [  167.738476] usb 3-1.3: New USB device found, idVendor=04d8, idProduct=003f
Apr 25 22:27:08 hp-elite kernel: [  167.738480] usb 3-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Apr 25 22:27:08 hp-elite kernel: [  167.738482] usb 3-1.3: Product: Filter Wheel 2
Apr 25 22:27:08 hp-elite kernel: [  167.738484] usb 3-1.3: Manufacturer: Atik Instruments
Apr 25 22:27:08 hp-elite kernel: [  168.009718] hidraw: raw HID events driver (C) Jiri Kosina
Apr 25 22:27:08 hp-elite kernel: [  168.021838] usbcore: registered new interface driver usbhid
Apr 25 22:27:08 hp-elite kernel: [  168.021839] usbhid: USB HID core driver
Apr 25 22:27:08 hp-elite kernel: [  168.160085] hid-generic 0003:04D8:003F.0001: hiddev0,hidraw0: USB HID v1.11 Device [Atik Instruments Filter Wheel 2] on usb-0000:00:14.0-1.3/input0
Apr 25 22:52:07 hp-elite kernel: [ 1667.199610] kstars[1998]: segfault at 6c ip 0000560b009d1c7d sp 00007ffc274b4e40 error 4 in kstars[560b005de000+d23000]

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