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I bought the LOTEKOO USB Wireless Network Adapter, Powerful 5dBi Antenna 600Mbps Dual Band from amazon. I been trying to get it to work with my Ubuntu: "Linux 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux". First I compiled and installed the drivers per instructions on GitHub.
But when I insert the USB Dongle is not detected.
Looking at syslog:

Nov  3 14:50:23 pluto mtp-probe: bus: 3, device: 20 was not an MTP device

Nov  3 14:51:49 pluto kernel: [ 1795.291025] usb 3-4: USB disconnect, device number 20

Nov  3 14:51:51 pluto kernel: [ 1797.327114] usb 3-4: new high-speed USB device number 21 using xhci_hcd

Nov  3 14:51:52 pluto kernel: [ 1797.475703] usb 3-4: New USB device found, idVendor=0bda, idProduct=c811

Nov  3 14:51:52 pluto kernel: [ 1797.475709] usb 3-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3

Nov  3 14:51:52 pluto kernel: [ 1797.475712] usb 3-4: Product: 802.11ac NIC

Nov  3 14:51:52 pluto kernel: [ 1797.475715] usb 3-4: Manufacturer: Realtek

Nov  3 14:51:52 pluto kernel: [ 1797.475718] usb 3-4: SerialNumber: 123456

Nov  3 14:51:52 pluto mtp-probe: checking bus 3, device 21: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-4"

Nov  3 14:51:52 pluto mtp-probe: bus: 3, device: 21 was not an MTP device

Nov  3 14:51:52 pluto kernel: [ 1797.726714] usb 3-4: USB disconnect, device number 21

Nov  3 14:51:52 pluto kernel: [ 1798.035116] usb 3-4: new high-speed USB device number 22 using xhci_hcd

Nov  3 14:51:52 pluto kernel: [ 1798.183466] usb 3-4: New USB device found, idVendor=0bda, idProduct=c811

Nov  3 14:51:52 pluto kernel: [ 1798.183472] usb 3-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3

Nov  3 14:51:52 pluto kernel: [ 1798.183475] usb 3-4: Product: 802.11ac NIC

Nov  3 14:51:52 pluto kernel: [ 1798.183479] usb 3-4: Manufacturer: Realtek

Nov  3 14:51:52 pluto kernel: [ 1798.183482] usb 3-4: SerialNumber: 123456

Nov  3 14:51:52 pluto mtp-probe: checking bus 3, device 22: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-4"

Nov  3 14:51:52 pluto mtp-probe: bus: 3, device: 22 was not an MTP device

Following some instructions I created a udev rules files:

db2admin@pluto:/etc/udev/rules.d$ cat 90-myrules.rules 

SUBSYSTEMS=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="c811", ATTRS{serial}=="123456"

When I look at the output of:

udevadm monitor --udev --property



UDEV  [1662.908962] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-4 (usb)

ACTION=remove

BUSNUM=003

DEVNAME=/dev/bus/usb/003/019

DEVNUM=019

DEVPATH=/devices/pci0000:00/0000:00:14.0/usb3/3-4

DEVTYPE=usb_device

ID_BUS=usb

ID_MODEL=802.11ac_NIC

ID_MODEL_ENC=802.11acx20NIC

ID_MODEL_ID=c811

ID_REVISION=0200

ID_SERIAL=Realtek_802.11ac_NIC_123456

ID_SERIAL_SHORT=123456

ID_USB_INTERFACES=:ffffff:

ID_VENDOR=Realtek

ID_VENDOR_ENC=Realtek

ID_VENDOR_FROM_DATABASE=Realtek Semiconductor Corp.

ID_VENDOR_ID=0bda

MAJOR=189

MINOR=274

PRODUCT=bda/c811/200

SEQNUM=7598

SUBSYSTEM=usb

TYPE=0/0/0

USEC_INITIALIZED=1648553212

UDEV  [1710.433564] add      /devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0 (usb)

.MM_USBIFNUM=00

ACTION=add

DEVPATH=/devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4:1.0

DEVTYPE=usb_interface

ID_VENDOR_FROM_DATABASE=Realtek Semiconductor Corp.

INTERFACE=255/255/255

MODALIAS=usb:v0BDApC811d0200dc00dsc00dp00icFFiscFFipFFin00

PRODUCT=bda/c811/200

SEQNUM=7619

SUBSYSTEM=usb

TYPE=0/0/0

USEC_INITIALIZED=1709427721

output of sudo lshw -C network:

USB


  *-network DISABLED

       description: Wireless interface

       product: Wireless 7260

       vendor: Intel Corporation

       physical id: 0

       bus info: pci@0000:06:00.0

       logical name: wlp6s0

       version: 6b

       serial: e8:b1:fc:50:1f:c7

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

       configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-34-generic firmware=17.608620.0 latency=0 link=no multicast=yes wireless=IEEE 802.11

       resources: irq:36 memory:f7900000-f7901fff

  *-network

       description: Wireless interface

       physical id: 2

       bus info: usb@3:3

       logical name: wlx503eaa53e6ba

       serial: 50:3e:aa:53:e6:ba

       capabilities: ethernet physical wireless

       configuration: broadcast=yes driver=r8188eu ip=192.168.1.165 multicast=yes wireless=IEEE 802.11bgn

does not show my third network device just the two that I have and work.

The command:

 lsusb

Bus 002 Device 002: ID 8087:8000 Intel Corp. 

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 001 Device 002: ID 8087:8008 Intel Corp. 

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 005: ID 8087:07dc Intel Corp. 

Bus 003 Device 004: ID 06cb:0ac3 Synaptics, Inc. 

Bus 003 Device 003: ID 0bda:c811 Realtek Semiconductor Corp. 

Bus 003 Device 002: ID 0bda:8179 Realtek Semiconductor Corp. RTL8188EUS 802.11n Wireless Network Adapter

Bus 003 Device 006: ID 0bda:573c Realtek Semiconductor Corp. 

Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

shows my device which is 0bda:c811 Realtek Semiconductor Corp. the second realtek device is another USB Wifi that is working but is not 5G.

sudo lshw -C network

  *-network DISABLED


       description: Wireless interface

       product: Wireless 7260

       vendor: Intel Corporation

       physical id: 0

       bus info: pci@0000:06:00.0

       logical name: wlp6s0

       version: 6b

       serial: e8:b1:fc:50:1f:c7

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

       configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-34-generic firmware=17.608620.0 latency=0 link=no multicast=yes wireless=IEEE 802.11

       resources: irq:36 memory:f7900000-f7901fff

  *-network

       description: Wireless interface

       physical id: 2

       bus info: usb@3:3

       logical name: wlx503eaa53e6ba

       serial: 50:3e:aa:53:e6:ba

       capabilities: ethernet physical wireless

       configuration: broadcast=yes driver=r8188eu ip=192.168.1.165 multicast=yes wireless=IEEE 802.11bgn

I wondering what I am i missing. Thanks for any help provided.

This answer should be credited to @chili555 who gave the correct answer in his comment above. For others that might be struggling with this here are the steps:
First enable/install dkms.

apt-get install dkms

Then here is the sequence of commands I followed:

2000  apt-get install dkms

2001  sudo apt-get install dkms

2002  cd Downloads/

2003  git clone https://github.com/whitebatman2/rtl8821CU.git

2004  export DRV_NAME=rtl8821CU

2005  export DRV_VERSION=5.2.5.3

2006  set |grep DRV

2007  sudo mkdir /usr/src/${DRV_NAME}-${DRV_VERSION}

2008  git archive master | sudo tar -x -C /usr/src/${DRV_NAME}-${DRV_VERSION}

2009  cd rtl8821CU/

2010  git archive master | sudo tar -x -C /usr/src/${DRV_NAME}-${DRV_VERSION}

2011  sudo dkms add -m ${DRV_NAME} -v ${DRV_VERSION}

2012  sudo dkms build -m ${DRV_NAME} -v ${DRV_VERSION}

2013  sudo dkms install -m ${DRV_NAME} -v ${DRV_VERSION}