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Salva42

Connection Wifi instable avec edubuntu 14-04

Bonjour, depuis le passage à 14.04, ma connection wifi ne tient pas plus d'une minute. J'ai essayé plein de choses glânées sur les forums, mais je ne suis pas très à l'aise avec linux. Merci de me donner un coup de main pour résoudre mon problème.
Je joint les infos récupérées
Ma carte wifi est une Ralink RT2500

martinez-baas@martinezbaas-MS-1058:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04 LTS"
martinez-baas@martinezbaas-MS-1058:~$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 003: ID 0db0:a970 Micro Star International Bluetooth dongle
Bus 002 Device 002: ID 0458:00a2 KYE Systems Corp. (Mouse Systems)
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

martinez-baas@martinezbaas-MS-1058:~$ lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD/ATI] RS480/RS482/RS485 Host Bridge (rev 10)
00:01.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RC4xx/RS4xx PCI Bridge [int gfx]
00:06.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RC4xx/RS4xx PCI Express Port 3
00:07.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RC4xx/RS4xx PCI Express Port 4
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 USB Host Controller (rev 80)
00:13.1 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 USB Host Controller (rev 80)
00:13.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 USB2 Host Controller (rev 80)
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 SMBus Controller (rev 83)
00:14.1 IDE interface: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 IDE Controller (rev 80)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 High Definition Audio Controller (rev 01)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 PCI-ISA Bridge (rev 80)
00:14.4 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 PCI-PCI Bridge (rev 80)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS482M [Mobility Radeon Xpress 200]
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 01)
05:04.0 FireWire (IEEE 1394): O2 Micro, Inc. Firewire (IEEE 1394) (rev 02)
05:04.2 SD Host controller: O2 Micro, Inc. Integrated MMC/SD Controller (rev 01)
05:04.3 Mass storage controller: O2 Micro, Inc. Integrated MS/xD Controller (rev 01)
05:09.0 Network controller: Ralink corp. RT2500 Wireless 802.11bg (rev 01)

martinez-baas@martinezbaas-MS-1058:~$ lspci -nn | grep -i net
04:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 01)
05:09.0 Network controller [0280]: Ralink corp. RT2500 Wireless 802.11bg [1814:0201] (rev 01)
martinez-baas@martinezbaas-MS-1058:~$
martinez-baas@martinezbaas-MS-1058:~$ lspci -k
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD/ATI] RS480/RS482/RS485 Host Bridge (rev 10)
    Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] RS480/RS482/RS485 Host Bridge
00:01.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RC4xx/RS4xx PCI Bridge [int gfx]
00:06.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RC4xx/RS4xx PCI Express Port 3
    Kernel driver in use: pcieport
00:07.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] RC4xx/RS4xx PCI Express Port 4
    Kernel driver in use: pcieport
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 USB Host Controller (rev 80)
    Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 USB Host Controller
    Kernel driver in use: ohci-pci
00:13.1 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 USB Host Controller (rev 80)
    Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 USB Host Controller
    Kernel driver in use: ohci-pci
00:13.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 USB2 Host Controller (rev 80)
    Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 USB2 Host Controller
    Kernel driver in use: ehci-pci
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 SMBus Controller (rev 83)
    Subsystem: Micro-Star International Co., Ltd. [MSI] Device a422
    Kernel driver in use: piix4_smbus
00:14.1 IDE interface: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 IDE Controller (rev 80)
    Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 IDE Controller
    Kernel driver in use: pata_atiixp
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 High Definition Audio Controller (rev 01)
    Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 High Definition Audio Controller
    Kernel driver in use: snd_hda_intel
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 PCI-ISA Bridge (rev 80)
00:14.4 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB4x0 PCI-PCI Bridge (rev 80)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
    Kernel driver in use: k8temp
01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS482M [Mobility Radeon Xpress 200]
    Subsystem: Micro-Star International Co., Ltd. [MSI] Device a422
    Kernel driver in use: radeon
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 01)
    Subsystem: Micro-Star International Co., Ltd. [MSI] Device a422
    Kernel driver in use: r8169
05:04.0 FireWire (IEEE 1394): O2 Micro, Inc. Firewire (IEEE 1394) (rev 02)
    Subsystem: O2 Micro, Inc. Firewire (IEEE 1394)
    Kernel driver in use: firewire_ohci
05:04.2 SD Host controller: O2 Micro, Inc. Integrated MMC/SD Controller (rev 01)
    Subsystem: Device 0001:0000
    Kernel driver in use: sdhci-pci
05:04.3 Mass storage controller: O2 Micro, Inc. Integrated MS/xD Controller (rev 01)
    Subsystem: Device 0001:0000
05:09.0 Network controller: Ralink corp. RT2500 Wireless 802.11bg (rev 01)
    Subsystem: Micro-Star International Co., Ltd. [MSI] Unknown 802.11g mini-PCI Adapter
    Kernel driver in use: rt2500pci

martinez-baas@martinezbaas-MS-1058:~$ sudo lshw -C network
[sudo] password for martinez-baas:
  *-network               
       description: Ethernet interface
       produit: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       fabriquant: Realtek Semiconductor Co., Ltd.
       identifiant matériel: 0
       information bus: pci@0000:04:00.0
       nom logique: eth0
       version: 01
       numéro de série: 00:16:17:4f:06:b0
       taille: 100Mbit/s
       capacité: 1Gbit/s
       bits: 64 bits
       horloge: 33MHz
       fonctionnalités: pm vpd msi pciexpress bus_master cap_list rom 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=full ip=192.168.1.10 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       ressources: irq:19 portE/S:b800(taille=256) mémoire:ffcff000-ffcfffff mémoire:ffce0000-ffceffff
  *-network DÉSACTIVÉ
       description: Interface réseau sans fil
       produit: RT2500 Wireless 802.11bg
       fabriquant: Ralink corp.
       identifiant matériel: 9
       information bus: pci@0000:05:09.0
       nom logique: wlan0
       version: 01
       numéro de série: 00:13:d3:78:de:61
       bits: 32 bits
       horloge: 33MHz
       fonctionnalités: pm bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rt2500pci driverversion=3.13.0-24-generic firmware=N/A latency=64 link=no multicast=yes wireless=IEEE 802.11bg
       ressources: irq:22 mémoire:ffdfa000-ffdfbfff

martinez-baas@martinezbaas-MS-1058:~$ lsmod
Module                  Size  Used by
btusb                  27580  0
xt_CHECKSUM            12493  1
iptable_mangle         12615  1
ipt_MASQUERADE         12760  1
iptable_nat            12867  1
nf_conntrack_ipv4      14492  1
nf_defrag_ipv4         12649  1 nf_conntrack_ipv4
nf_nat_ipv4            13095  1 iptable_nat
nf_nat                 20826  3 ipt_MASQUERADE,nf_nat_ipv4,iptable_nat
nf_conntrack           83685  5 ipt_MASQUERADE,nf_nat,nf_nat_ipv4,iptable_nat,nf_conntrack_ipv4
xt_tcpudp              12756  5
bridge                 94674  0
stp                    12848  1 bridge
llc                    14160  2 stp,bridge
iptable_filter         12706  1
ip_tables              17987  3 iptable_filter,iptable_mangle,iptable_nat
x_tables               22067  6 xt_CHECKSUM,ip_tables,xt_tcpudp,ipt_MASQUERADE,iptable_filter,iptable_mangle
rfcomm                 53664  8
bnep                   18895  2
bluetooth             342263  22 bnep,btusb,rfcomm
binfmt_misc            13140  1
msi_laptop             15086  0
sparse_keymap          13708  1 msi_laptop
snd_hda_codec_si3054    12864  1
snd_hda_codec_realtek    51029  1
joydev                 17101  0
snd_hda_intel          42730  6
snd_hda_codec         164067  3 snd_hda_codec_realtek,snd_hda_codec_si3054,snd_hda_intel
snd_hwdep              13272  1 snd_hda_codec
snd_pcm                85501  5 snd_hda_codec_si3054,snd_hda_codec,snd_hda_intel
snd_page_alloc         14230  2 snd_pcm,snd_hda_intel
snd_seq_midi           13132  0
snd_seq_midi_event     14475  1 snd_seq_midi
arc4                   12536  2
snd_rawmidi            25135  1 snd_seq_midi
rt2500pci              22723  0
rt2x00pci              13111  1 rt2500pci
kvm_amd                50537  0
rt2x00mmio             13395  1 rt2500pci
snd_seq                55383  2 snd_seq_midi_event,snd_seq_midi
rt2x00lib              48886  3 rt2x00pci,rt2500pci,rt2x00mmio
kvm                   388083  1 kvm_amd
mac80211              545990  2 rt2x00lib,rt2x00pci
snd_seq_device         14137  3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer              28584  2 snd_pcm,snd_seq
snd                    60871  21 snd_hda_codec_realtek,snd_hda_codec_si3054,snd_hwdep,snd_timer,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_seq_midi
psmouse                91033  0
cfg80211              409394  2 mac80211,rt2x00lib
radeon               1416373  2
k8temp                 12842  0
eeprom_93cx6           13168  1 rt2500pci
serio_raw              13230  0
ttm                    72698  1 radeon
drm_kms_helper         46907  1 radeon
drm                   243792  4 ttm,drm_kms_helper,radeon
i2c_algo_bit           13197  1 radeon
soundcore              12600  1 snd
ati_agp                13177  0
shpchp                 32128  0
i2c_piix4              17723  0
parport_pc             31981  0
ppdev                  17391  0
video                  18903  0
lp                     13299  0
parport                40836  3 lp,ppdev,parport_pc
mac_hid                13037  0
hid_generic            12492  0
usbhid                 47035  0
hid                    87604  2 hid_generic,usbhid
pata_acpi              12886  0
firewire_ohci          35529  0
sdhci_pci              18535  0
firewire_core          61867  1 firewire_ohci
sdhci                  37779  1 sdhci_pci
crc_itu_t              12627  1 firewire_core
r8169                  61562  0
pata_atiixp            13058  2
mii                    13654  1 r8169

martinez-baas@martinezbaas-MS-1058:~$ iwconfig
wlan0     IEEE 802.11bg  ESSID:off/any 
          Mode:Managed  Access Point: Not-Associated   Tx-Power=off   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
         
lo        no wireless extensions.

eth0      no wireless extensions.

lxcbr0    no wireless extensions.

martinez-baas@martinezbaas-MS-1058:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:17:4f:06:b0 
          inet adr:192.168.1.10  Bcast:192.168.1.255  Masque:255.255.255.0
          adr inet6: fe80::216:17ff:fe4f:6b0/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:21921 erreurs:0 :0 overruns:0 frame:0
          TX packets:21595 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000
          Octets reçus:19573728 (19.5 MB) Octets transmis:3504382 (3.5 MB)

lo        Link encap:Boucle locale 
          inet adr:127.0.0.1  Masque:255.0.0.0
          adr inet6: ::1/128 Scope:Hôte
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          Packets reçus:1863 erreurs:0 :0 overruns:0 frame:0
          TX packets:1863 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0
          Octets reçus:153100 (153.1 KB) Octets transmis:153100 (153.1 KB)

lxcbr0    Link encap:Ethernet  HWaddr 5e:14:10:34:91:07 
          inet adr:10.0.3.1  Bcast:10.0.3.255  Masque:255.255.255.0
          adr inet6: fe80::5c14:10ff:fe34:9107/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
          TX packets:61 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0
          Octets reçus:0 (0.0 B) Octets transmis:10893 (10.8 KB)

martinez-baas@martinezbaas-MS-1058:~$ sudo iwlist scan
wlan0     Interface doesn't support scanning : Network is down

lo        Interface doesn't support scanning.

eth0      Interface doesn't support scanning.

lxcbr0    Interface doesn't support scanning.

martinez-baas@martinezbaas-MS-1058:~$ uname -r -m
3.13.0-24-generic i686
martinez-baas@martinezbaas-MS-1058:~$ cat  /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

martinez-baas@martinezbaas-MS-1058:~$ nm-tool

NetworkManager Tool

State: connected (global)

- Device: wlan0 ----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            rt2500pci
  State:             unavailable
  Default:           no
  HW Address:        00:13:D3:78:DE:61

  Capabilities:

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points

- Device: eth0  [Connexion filaire 1] ------------------------------------------
  Type:              Wired
  Driver:            r8169
  State:             connected
  Default:           yes
  HW Address:        00:16:17:4F:06:B0

  Capabilities:
    Carrier Detect:  yes
    Speed:           100 Mb/s

  Wired Properties
    Carrier:         on

  IPv4 Settings:
    Address:         192.168.1.10
    Prefix:          24 (255.255.255.0)
    Gateway:         192.168.1.1

    DNS:             192.168.1.1

martinez-baas@martinezbaas-MS-1058:~$ sudo rfkill list
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: yes
1: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no