Ubuntu: Wireless card not detected… sometimes


I am usiong Ubuntu 14.04 amd64.

Today, I started having problems with my wireless card (manufactured by TP-Link, I don't remember the exact model). The system didn't detect it (it wasn't displayed after using lshw -C network). After two reboots, it appeared, but then, after shutting down the computer and starting it again sometime later, the problem repeated itself. This time, one reboot was sufficient to make it work.

When it is detected, its' description in lshw -C network output is the following:

  *-network     description: Wireless interface     product: AR2417 Wireless Network Adapter [AR5007G 802.11bg]     vendor: Qualcomm Atheros     physical id: 2     bus info: pci@0000:05:02.0     logical name: wlan0     version: 01     serial: 00:27:19:c3:35:b2     width: 32 bits     clock: 33MHz     capabilities: bus_master cap_list ethernet physical wireless     configuration: broadcast=yes driver=ath5k driverversion=3.13.0-24-generic firmware=N/A ip= latency=168 link=yes maxlatency=28 mingnt=10 multicast=yes wireless=IEEE 802.11bg     resources: irq:23 memory:ff9f0000-ff9fffff  

What can I do to make it work every time?

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