I just buy a new USB 3.0 Gigabit Ethernet Adapter and I can't install it in Ubuntu 18.04.1 server x64 edition.

I contact tp-link support and they send me the driver. I install the driver but my adapter is still without Internet connection. I follow this steps too and without any success.

Anyone can help me to fix this issue?

EDIT:

Output of `ifconfig`



enp19s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500

        ether 78:2b:cb:e9:d5:3c  txqueuelen 1000  (Ethernet)

        RX packets 0  bytes 0 (0.0 B)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 0  bytes 0 (0.0 B)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



enx503eaa8b183c: flags=4098<BROADCAST,MULTICAST>  mtu 1500

        ether 50:3e:aa:8b:18:3c  txqueuelen 1000  (Ethernet)

        RX packets 0  bytes 0 (0.0 B)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 0  bytes 0 (0.0 B)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 1000  (Local Loopback)

        RX packets 226  bytes 15022 (15.0 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 226  bytes 15022 (15.0 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



wlp18s0: flags=4098<BROADCAST,MULTICAST>  mtu 1500

        ether 18:f4:6a:3f:af:11  txqueuelen 1000  (Ethernet)

        RX packets 0  bytes 0 (0.0 B)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 0  bytes 0 (0.0 B)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Output for sudo lshw -c network

 *-network DISABLED

       description: Wireless interface

       product: AR9285 Wireless Network Adapter (PCI-Express)

       vendor: Qualcomm Atheros

       physical id: 0

       bus info: pci@0000:12:00.0

       logical name: wlp18s0

       version: 01

       serial: 18:f4:6a:3f:af:11

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

       configuration: broadcast=yes driver=ath9k driverversion=4.15.0-38-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11

       resources: irq:17 memory:fbc00000-fbc0ffff

  *-network

       description: Ethernet interface

       product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller

       vendor: Realtek Semiconductor Co., Ltd.

       physical id: 0

       bus info: pci@0000:13:00.0

       logical name: enp19s0

       version: 02

       serial: 78:2b:cb:e9:d5:3c

       size: 10Mbit/s

       capacity: 100Mbit/s

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation

       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half latency=0 link=no multicast=yes port=MII speed=10Mbit/s

       resources: irq:18 ioport:e000(size=256) memory:d0b10000-d0b10fff memory:d0b00000-d0b0ffff memory:fb200000-fb21ffff

  *-network DISABLED

       description: Ethernet interface

       physical id: 2

       logical name: enx503eaa8b183c

       serial: 50:3e:aa:8b:18:3c

       size: 100Mbit/s

       capacity: 1Gbit/s

       capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation

       configuration: autonegotiation=on broadcast=yes driver=r8152 driverversion=v1.09.9 duplex=full link=no multicast=yes port=MII speed=100Mbit/s

The name of the file that is in the /etc/netplan/01-netcfg.yaml

CONTENT of /etc/netplan/01-netcfg.yaml

  # This file describes the network interfaces available on your system

    # For more information, see netplan(5).

    network:

      version: 2

      renderer: networkd

      ethernets:

        enp19s0:

          dhcp4: yes

Thank you in advance.