我是20M的光纤网，在windows下很快，在ubuntu 下很慢，（windows---2.5mb/s,ubuntu---30kb/s)
请高手帮助，谢谢！
使用路由器，有线、无线都不行。

说明具体情况：
1. 说明有线网/无线网
2. 终端执行下面指令将结果全部复制贴上来

ubuntu:~$ lspci -knn
00:00.0 Host bridge [0600]: Intel Corporation 4 Series Chipset DRAM Controller [8086:2e30] (rev 03)
Subsystem: Lenovo Device [17aa:300e]
00:01.0 PCI bridge [0604]: Intel Corporation 4 Series Chipset PCI Express Root Port [8086:2e31] (rev 03)
Kernel driver in use: pcieport
00:1b.0 Audio device [0403]: Intel Corporation NM10/ICH7 Family High Definition Audio Controller [8086:27d8] (rev 01)
Subsystem: Lenovo Device [17aa:300e]
Kernel driver in use: snd_hda_intel
00:1c.0 PCI bridge [0604]: Intel Corporation NM10/ICH7 Family PCI Express Port 1 [8086:27d0] (rev 01)
Kernel driver in use: pcieport
00:1c.1 PCI bridge [0604]: Intel Corporation NM10/ICH7 Family PCI Express Port 2 [8086:27d2] (rev 01)
Kernel driver in use: pcieport
00:1d.0 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 [8086:27c8] (rev 01)
Subsystem: Lenovo Device [17aa:300e]
Kernel driver in use: uhci_hcd
00:1d.1 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 [8086:27c9] (rev 01)
Subsystem: Lenovo Device [17aa:300e]
Kernel driver in use: uhci_hcd
00:1d.2 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 [8086:27ca] (rev 01)
Subsystem: Lenovo Device [17aa:300e]
Kernel driver in use: uhci_hcd
00:1d.3 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 [8086:27cb] (rev 01)
Subsystem: Lenovo Device [17aa:300e]
Kernel driver in use: uhci_hcd
00:1d.7 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller [8086:27cc] (rev 01)
Subsystem: Lenovo Device [17aa:300e]
Kernel driver in use: ehci-pci
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 PCI Bridge [8086:244e] (rev e1)
00:1f.0 ISA bridge [0601]: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge [8086:27b8] (rev 01)
Subsystem: Lenovo Device [17aa:300e]
Kernel driver in use: lpc_ich
00:1f.2 IDE interface [0101]: Intel Corporation NM10/ICH7 Family SATA Controller [IDE mode] [8086:27c0] (rev 01)
Subsystem: Lenovo Device [17aa:300e]
Kernel driver in use: ata_piix
00:1f.3 SMBus [0c05]: Intel Corporation NM10/ICH7 Family SMBus Controller [8086:27da] (rev 01)
Subsystem: Lenovo Device [17aa:300e]
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Cedar [Radeon HD 5000/6000/7350/8350 Series] [1002:68f9]
Subsystem: Bitland(ShenZhen) Information Technology Co., Ltd. Radeon HD 5450 [1642:3997]
Kernel driver in use: radeon
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 02)
Subsystem: Lenovo Device [17aa:300e]
Kernel driver in use: r8169
03:00.0 Network controller [0280]: Broadcom Corporation BCM43225 802.11b/g/n [14e4:4357] (rev 01)
Subsystem: Broadcom Corporation Device [14e4:04da]
Kernel driver in use: bcma-pci-bridge

局域网内用有线、无线网传输文件测试速度
局域网内用 iperf 测试速度


有线、无线网卡的驱动情况都堪忧。
RTL8101/2/6E 的驱动问题较多，见 viewtopic.php?p=3155114#p3155114
BCM43225 有三款驱动可用： brcmsmac, b43, wl，目前作用中驱动 brcmsmac
换用其它两款驱动试试

更换 b43 方法
安装 firmware-b43-installer，将 brcm80211 brcmsmac 加入黑名单 ( /etc/modprobe.d/ )

更换 wl 方法
安装 broadcom-sta-dkms 或 bcmwl-kernel-source

不会更换。

内网用 iperf 测试一下速度，进一步定位问题
用另一台电脑配合测试。安卓手机安装 iPerf for Android 也可以。

我把4楼意思总结下，你的网卡对linux不够友好，买个对linux友好的换上