在 Dell Inspiron-3543 上使用 Ubuntu 16.04 时互联网速度很慢

Question

我的笔记本电脑上网速度非常慢。当我下载某些内容时，速度最高可达 700KB，然后又降到 0KB，一直这样。

我尝试了一些解决方案，但没有一个能够解决我的问题，例如：忽略 IP6 等。

我不知道应该运行哪些命令来检查问题。请指导我。谢谢

sudo lshw -class network command output: 
  *-network               
       description: Wireless interface
       product: BCM43142 802.11b/g/n
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:06:00.0
       logical name: wlp6s0
       version: 01
       serial: 18:4f:32:fb:1c:d7
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=wl0 driverversion=6.30.223.271 (r587334) ip=172.16.0.178 latency=0 multicast=yes wireless=IEEE 802.11abg
       resources: irq:18 memory:aa100000-aa107fff
  *-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@0000:07:00.0
       logical name: enp7s0
       version: 07
       serial: 74:e6:e2:52:70:79
       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 driverversion=2.3LK-NAPI duplex=half firmware=rtl8106e-1_0.0.1 06/29/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:47 ioport:3000(size=256) memory:aa000000-aa000fff memory:c0000000-c0003fff