roy@roy-Inspiron-7537:~$ iwlist wlan0 scan
wlan0 Interface doesn't support scanning.
图标显示上下两个箭头，可以连接之前保存的wifi。求解

http://unix.stackexchange.com/questions ... mmand-line
How to bring up a wi-fi interface from a command line?

http://unix.stackexchange.com/questions ... -lts-10-04
'iwlist' -> interface doesn't support scanning (Ubuntu LTS 10.04)

顺便执行以下命令将结果全部复制贴上来

楼主，我现在安装的ubuntu14.04 本来好好的，被同学用了一天电脑，然后就出现死机情况了，我重新装了个，还是容易死机，进去之后，隔一段是时间就会死机。要奔溃了，查百度也没用。

roy@roy-Inspiron-7537:~$ uname -a
Linux roy-Inspiron-7537 4.4.0-28-generic #47-Ubuntu SMP Fri Jun 24 10:09:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
roy@roy-Inspiron-7537:~$ lspci -knn | grep -iA2 net
02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73)
Subsystem: Intel Corporation Dual Band Wireless-N 7260 [8086:4460]
Kernel driver in use: iwlwifi
--
03:00.1 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 12)
Subsystem: Dell RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1028:05f9]
Kernel driver in use: r8169
Kernel modules: r8169
roy@roy-Inspiron-7537:~$ sudo lshw -C net
[sudo] roy 的密码：
*-network
description: Wireless interface
product: Wireless 7260
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlp2s0
version: 73
serial: ac:7b:a1:0b:ec:30
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=4.4.0-28-generic firmware=16.242414.0 ip=192.168.1.114 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
resources: irq:47 memory:e3500000-e3501fff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0.1
bus info: pci@0000:03:00.1
logical name: enp3s0f1
version: 12
serial: e0:db:55:c7:e8:2c
size: 10Mbit/s
capacity: 1Gbit/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 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8411-2_0.0.1 07/08/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:43 ioport:4000(size=256) memory:e3404000-e3404fff memory:e3400000-e3403fff

我也是新来的，很多问题不会解决，才来这里问的呀，应该是装了什么不兼容的包导致的

无线网卡界面名称不是 wlan0 而是 wlp2s0，需指定正确的无线网卡界面名称。
只有一张无线网卡，使用 iwlist 时无需指定无线网卡界面名称，直接使用 iwlist scan 不点名搜索即可。

新的网卡界面命名规则 参考
https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/
https://major.io/2015/08/21/understanding-systemds-predictable-network-device-names/
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Networking_Guide/sec-Understanding_the_Predictable_Network_Interface_Device_Names.html

也就是说这是一个软件问题，网卡和gui的链接有问题

除了不能使用 'iwlist wlan0 scan' 搜索外，还有其它问题么？
若有，说明之
若没有，则不是软件问题，而是软件使用者(楼主您)执行的命令有误。

好的，我大概知道我做了什么蠢b事情啦。谢谢大大