My wifi worked perfect until I updated to the latest version of Ubuntu. Now I don't find any wireless connections at all.

I have tried lots of guides on the internet but I can't get it to work. I did however start to work once after writing something I don't remember in Terminal, but after rebooting it stopped working again.

Some info (don't know if you need more to help):

01:00.0 Ethernet controller: Atheros Communications AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0)
    Subsystem: Acer Incorporated [ALI] Device 022c
    Flags: bus master, fast devsel, latency 0, IRQ 44
    Memory at 55200000 (64-bit, non-prefetchable) [size=256K]
    I/O ports at 3000 [size=128]
    Capabilities: [40] Power Management version 2
    Capabilities: [48] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [58] Express Endpoint, MSI 00
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [180] Device Serial Number ff-93-2e-de-00-23-8b-ff
    Kernel driver in use: ATL1E
    Kernel modules: atl1e

02:00.0 Ethernet controller: Atheros Communications Inc. AR242x / AR542x Wireless Network Adapter (PCI-Express) (rev 01)
    Subsystem: Foxconn International, Inc. Device e00d
    Flags: bus master, fast devsel, latency 0, IRQ 18
    Memory at 54100000 (64-bit, non-prefetchable) [size=64K]
    Capabilities: [40] Power Management version 2
    Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit-
    Capabilities: [60] Express Legacy Endpoint, MSI 00
    Capabilities: [90] MSI-X: Enable- Count=1 Masked-
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [140] Virtual Channel
    Kernel driver in use: ath5k
    Kernel modules: ath5k