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Ubuntu 18.04 无线网络问题

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Ubuntu 18.04 无线网络问题

自从几个月前安装 Linux 以来，我一直遇到 wifi 问题，但由于我一直使用以太网电缆，所以我没有太在意它。但现在，我无法使用以太网电缆。

我的 wifi 卡无法连接，一直提示“激活网络连接失败”

我买了一个 USB wifi 适配器。现在它工作了一段时间，然后不知什么原因就停止工作了。现在，它不断要求我输入密码。

我今天重新安装了 Ubuntu，但问题仍然存在。目前，我一直在使用手机的 USB 网络共享作为短期解决方案。有什么帮助吗？

  **sudo lshw -C network**

   *-network                 
       description: Ethernet interface
       product: RTL810xE PCI Express Fast Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:07:00.0
       logical name: enp7s0
       version: 05
       serial: e0:db:55:e3:1f:d8
       size: 10Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=half firmware=rtl_nic/rtl8105e-1.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:16 ioport:2000(size=256) memory:c1404000-c1404fff memory:c1400000-c1403fff
  *-network
       description: Wireless interface
       product: MT7630e 802.11bgn Wireless Network Adapter
       vendor: MEDIATEK Corp.
       physical id: 0
       bus info: pci@0000:08:00.0
       logical name: wlp8s0f0
       version: 00
       serial: fc:4d:d4:51:c3:48
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=mt76x0e driverversion=5.0.0-25-generic firmware=1.0.07-b370 latency=0 link=no multicast=yes wireless=IEEE 802.11
       resources: irq:17 memory:c1500000-c15fffff
  *-network:0
       description: Wireless interface
       physical id: 2
       bus info: usb@3:1
       logical name: wlx78321b9197f1
       serial: 78:32:1b:91:97:f1
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=r8188eu multicast=yes wireless=unassociated
  *-network:1
       description: Ethernet interface
       physical id: 3
       logical name: enp0s20u3
       serial: 92:03:7d:73:a9:9f
       capabilities: ethernet physical
       configuration: broadcast=yes driver=rndis_host driverversion=22-Aug-2005 firmware=RNDIS device ip=192.168.42.215 link=yes multicast=yes

**rfkill list all**

0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

我已经束手无策了。我尝试了网上列出的许多解决方案，但都没有用。我希望这个问题能得到解决

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