I am trying to install a CSR 4.0 Bluetooth dongle, it was advertised as Linux compatible on ebay. I am using Mint on a desktop that doesn't have it' own bluetooth.

The settings show there are no Bluetooth devices even though it is plugged in.

Is there a way to fix this or should I give a bad report in on ebay and choose a recommended brand?

I guess my first question would be do you have bluetooth support installed in Mint? And does it even recognize? Can you post the output lspci & lsusb with it plugged in?

I have software for bluetooth ticked in my software list as I sought and downloaded some other programs, including a program to scan for devices.
bren-ThinkCentre-M92p bren # lspci
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
00:16.3 Serial controller: Intel Corporation 7 Series/C210 Series Chipset Family KT Controller (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.4 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 5 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a4)
00:1f.0 ISA bridge: Intel Corporation Q77 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series/C210 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
02:00.0 Network controller: Intel Corporation Centrino Wireless-N 105 (rev c4)

lsusb
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 152d:2339 JMicron Technology Corp. / JMicron USA Technology Corp. JM20339 SATA Bridge
Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 04d9:1702 Holtek Semiconductor, Inc. Keyboard LKS02
Bus 003 Device 002: ID 093a:2521 Pixart Imaging, Inc. Optical Mouse
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Ok, well I don't see it listed. Can you unplug and plug in the dongle (in order to get any relevant messages freshly renewed) and then post the output of 'dmesg -H | tail -50'?

dmesg -H
[Feb15 20:34] Initializing cgroup subsys cpuset
[ +0.000000] Initializing cgroup subsys cpu
[ +0.000000] Initializing cgroup subsys cpuacct
[ +0.000000] Linux version 4.4.0-21-generic (buildd@lgw01-21) (gcc version 5.3.
[ +0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic root=UUID=
[ +0.000000] KERNEL supported cpus:
[ +0.000000] Intel GenuineIntel
[ +0.000000] AMD AuthenticAMD
[ +0.000000] Centaur CentaurHauls
[ +0.000000] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
[ +0.000000] x86/fpu: Supporting XSAVE feature 0x01: 'x87 floating point regist
[ +0.000000] x86/fpu: Supporting XSAVE feature 0x02: 'SSE registers'
[ +0.000000] x86/fpu: Supporting XSAVE feature 0x04: 'AVX registers'
[ +0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, u
[ +0.000000] x86/fpu: Using 'eager' FPU context switches.
[ +0.000000] e820: BIOS-provided physical RAM map:
[ +0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009d7ff] usable
[ +0.000000] BIOS-e820: [mem 0x000000000009d800-0x000000000009ffff] reserved
[ +0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[ +0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001fffffff] usable
[ +0.000000] BIOS-e820: [mem 0x0000000020000000-0x00000000201fffff] reserved
[ +0.000000] BIOS-e820: [mem 0x0000000020200000-0x0000000040003fff] usable
[ +0.000000] BIOS-e820: [mem 0x0000000040004000-0x0000000040004fff] reserved
[ +0.000000] BIOS-e820: [mem 0x0000000040005000-0x00000000d420afff] usable
[ +0.000000] BIOS-e820: [mem 0x00000000d420b000-0x00000000d4604fff] reserved
[ +0.000000] BIOS-e820: [mem 0x00000000d4605000-0x00000000d4619fff] ACPI data
[ +0.000000] BIOS-e820: [mem 0x00000000d461a000-0x00000000d46bafff] reserved
[ +0.000000] BIOS-e820: [mem 0x00000000d46bb000-0x00000000d46c2fff] ACPI data
[ +0.000000] BIOS-e820: [mem 0x00000000d46c3000-0x00000000d4d74fff] usable
[ +0.000000] BIOS-e820: [mem 0x00000000d4d75000-0x00000000d66a1fff] ACPI NVS
[ +0.000000] BIOS-e820: [mem 0x00000000d66a2000-0x00000000d683bfff] reserved
[ +0.000000] BIOS-e820: [mem 0x00000000d683c000-0x00000000d683cfff] usable
[ +0.000000] BIOS-e820: [mem 0x00000000d683d000-0x00000000d687ffff] ACPI NVS
[ +0.000000] BIOS-e820: [mem 0x00000000d6880000-0x00000000d6ffffff] usable
[ +0.000000] BIOS-e820: [mem 0x00000000d7800000-0x00000000df9fffff] reserved
[ +0.000000] BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved
[ +0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
[ +0.000000] BIOS-e820: [mem 0x00000000fed00000-0x00000000fed03fff] reserved
[ +0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
[ +0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[ +0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
[ +0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000021e5fffff] usable
[ +0.000000] NX (Execute Disable) protection: active
[ +0.000000] SMBIOS 2.7 present.
[ +0.000000] DMI: LENOVO 3238CTO/MAHOBAY, BIOS 9SKT63AUS 03/21/2013
[ +0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
:

I could not fine the vertical line you typed in.

remove [mem 0x000a0000-0x000fffff] usable
[ +0.000000] e820: last_pfn = 0x21e600 max_arch_pfn = 0x400000000
[ +0.000000] MTRR default type: uncachable
[ +0.000000] MTRR fixed ranges enabled:
[ +0.000000] 00000-9FFFF write-back
[ +0.000000] A0000-BFFFF uncachable
[ +0.000000] C0000-CFFFF write-protect
[ +0.000000] D0000-E7FFF uncachable
[ +0.000000] E8000-FFFFF write-protect
[ +0.000000] MTRR variable ranges enabled:
[ +0.000000] 0 base 000000000 mask E00000000 write-back
[ +0.000000] 1 base 200000000 mask FE0000000 write-back
[ +0.000000] 2 base 0E0000000 mask FE0000000 uncachable
[ +0.000000] 3 base 0D8000000 mask FF8000000 uncachable
[ +0.000000] 4 base 0D7800000 mask FFF800000 uncachable
[ +0.000000] 5 base 21F000000 mask FFF000000 uncachable
[ +0.000000] 6 base 21E800000 mask FFF800000 uncachable
[ +0.000000] 7 base 21E600000 mask FFFE00000 uncachable
[ +0.000000] 8 disabled
[ +0.000000] 9 disabled
[ +0.000000] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WC UC- WT
[ +0.000000] original variable MTRRs
[ +0.000000] reg 0, base: 0GB, range: 8GB, type WB

[ +0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[ +0.000000] e820: last_pfn = 0x21e600 max_arch_pfn = 0x400000000
[ +0.000000] MTRR default type: uncachable
[ +0.000000] MTRR fixed ranges enabled:
[ +0.000000] 00000-9FFFF write-back
[ +0.000000] A0000-BFFFF uncachable
[ +0.000000] C0000-CFFFF write-protect
[ +0.000000] D0000-E7FFF uncachable
[ +0.000000] E8000-FFFFF write-protect
[ +0.000000] MTRR variable ranges enabled:
[ +0.000000] 0 base 000000000 mask E00000000 write-back
[ +0.000000] 1 base 200000000 mask FE0000000 write-back
[ +0.000000] 2 base 0E0000000 mask FE0000000 uncachable
[ +0.000000] 3 base 0D8000000 mask FF8000000 uncachable
[ +0.000000] 4 base 0D7800000 mask FFF800000 uncachable
[ +0.000000] 5 base 21F000000 mask FFF000000 uncachable
[ +0.000000] 6 base 21E800000 mask FFF800000 uncachable
[ +0.000000] 7 base 21E600000 mask FFFE00000 uncachable
[ +0.000000] 8 disabled
[ +0.000000] 9 disabled
[ +0.000000] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WC UC- WT
[ +0.000000] original variable MTRRs
[ +0.000000] reg 0, base: 0GB, range: 8GB, type WB
[ +0.000000] reg 1, base: 8GB, range: 512MB, type WB
[ +0.000000] reg 2, base: 3584MB, range: 512MB, type UC
[ +0.000000] reg 3, base: 3456MB, range: 128MB, type UC
[ +0.000000] reg 4, base: 3448MB, range: 8MB, type UC
[ +0.000000] reg 5, base: 8688MB, range: 16MB, type UC
[ +0.000000] reg 6, base: 8680MB, range: 8MB, type UC
[ +0.000000] reg 7, base: 8678MB, range: 2MB, type UC
[ +0.000000] total RAM covered: 8030M
[ +0.000000] gran_size: 64K chunk_size: 64K num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 64K chunk_size: 128K num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 64K chunk_size: 256K num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 64K chunk_size: 512K num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 64K chunk_size: 1M num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 64K chunk_size: 2M num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 64K chunk_size: 4M num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 64K chunk_size: 8M num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 64K chunk_size: 16M num_reg: 10 lose cover RAM: 6M
[ +0.000000] gran_size: 64K chunk_size: 32M num_reg: 10 lose cover RAM: 0G
[ +0.000000] gran_size: 64K chunk_size: 64M num_reg: 10 lose cover RAM: 0G
[ +0.000000] gran_size: 64K chunk_size: 128M num_reg: 10 lose cover RAM: 0G
[ +0.000000] gran_size: 64K chunk_size: 256M num_reg: 10 lose cover RAM: 0G
[ +0.000000] gran_size: 64K chunk_size: 512M num_reg: 10 lose cover RAM: 0G
[ +0.000000] gran_size: 64K chunk_size: 1G num_reg: 10 lose cover RAM: 0G
[ +0.000000] *BAD*gran_size: 64K chunk_size: 2G num_reg: 10 lose cover RAM: -1G
[ +0.000000] gran_size: 128K chunk_size: 128K num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 128K chunk_size: 256K num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 128K chunk_size: 512K num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 128K chunk_size: 1M num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 128K chunk_size: 2M num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 128K chunk_size: 4M num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 128K chunk_size: 8M num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 128K chunk_size: 16M num_reg: 10 lose cover RAM: 6M
[ +0.000000] gran_size: 128K chunk_size: 32M num_reg: 10 lose cover RAM: 0G
[ +0.000000] gran_size: 128K chunk_size: 64M num_reg: 10 lose cover RAM: 0G
[ +0.000000] gran_size: 128K chunk_size: 128M num_reg: 10 lose cover RAM: 0G
[ +0.000000] gran_size: 128K chunk_size: 256M num_reg: 10 lose cover RAM: 0G
[ +0.000000] gran_size: 128K chunk_size: 512M num_reg: 10 lose cover RAM: 0G
[ +0.000000] gran_size: 128K chunk_size: 1G num_reg: 10 lose cover RAM: 0G
[ +0.000000] *BAD*gran_size: 128K chunk_size: 2G num_reg: 10 lose cover RAM: -1G
[ +0.000000] gran_size: 256K chunk_size: 256K num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 256K chunk_size: 512K num_reg: 10 lose cover RAM: 102M
[ +0.000000] gran_size: 256K chunk_size: 1M num_reg: 10 lose cover RAM: 102M
:

And other USB devices (mice, KB, etc) work in this same usb port, yes?

Yes, Flash Drives and Printer...
I am waiting for the seller to reply to curb a negative report.

# blueman-applet
blueman-applet version 2.0.4 starting
Traceback (most recent call last):
File "/usr/bin/blueman-applet", line 121, in <module>
BluemanApplet()
File "/usr/bin/blueman-applet", line 59, in __init__
self.DbusSvc = DbusService("org.blueman.Applet", "/")
File "/usr/lib/python3/dist-packages/blueman/main/DbusService.py", line 18, in __init__
self.bus = bus()
File "/usr/lib/python3/dist-packages/dbus/_dbus.py", line 211, in __new__
mainloop=mainloop)
File "/usr/lib/python3/dist-packages/dbus/_dbus.py", line 100, in __new__
bus = BusConnection.__new__(subclass, bus_type, mainloop=mainloop)
File "/usr/lib/python3/dist-packages/dbus/bus.py", line 122, in __new__
bus = cls._new_for_bus(address_or_type, mainloop=mainloop)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

Yeah, I think you might have gotten a defective one. From your dmesg, it doesn't appear your pc sees it being plugged in. Like, not that it can't determine a driver, but it plain and simple doesn't see that there's something there.