Bonjour,
J'utilise une clé wifi usb Belkin N300 [Realtek RTL8192CU] sur un pc portable. Depuis mon passage à la version 18.04.1, le wifi ne fonctionne plus.
La clé semble être à moitié reconnue, mais impossible de l'activer. Sur l'ancienne LTS (16.04), elle fonctionnait grâce à cette manip :
https://forum.ubuntu-fr.org/viewtopic.php?id=1170821
>> cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"
>> lsusb
Bus 002 Device 002: ID 050d:2103 Belkin Components F7D2102 802.11n N300 Micro Wireless Adapter v3000 [Realtek RTL8192CU]
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
>> lspci -k -nn | grep -A 3 -i net
04:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 02)
Subsystem: Micro-Star International Co., Ltd. [MSI] RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1462:7220]
Kernel driver in use: r8169
Kernel modules: r8169
05:00.0 Network controller [0280]: Intel Corporation WiFi Link 5100 [8086:4232]
Subsystem: Intel Corporation WiFi Link 5100 AGN [8086:1301]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
>> sudo lshw -C network
*-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: enp4s0
version: 02
numéro de série: 00:21:85:49:c0:e1
taille: 1Gbit/s
capacité: 1Gbit/s
bits: 64 bits
horloge: 33MHz
fonctionnalités: pm msi pciexpress msix vpd 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=192.168.1.21 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
ressources: irq:17 portE/S:d800(taille=256) mémoire:f9eff000-f9efffff mémoire:cfff0000-cfffffff mémoire:f9ec0000-f9edffff
*-network DÉSACTIVÉ
description: Interface réseau sans fil
produit: WiFi Link 5100
fabriquant: Intel Corporation
identifiant matériel: 0
information bus: pci@0000:05:00.0
nom logique: wlp5s0
version: 00
numéro de série: 00:16:ea:5c:48:5e
bits: 64 bits
horloge: 33MHz
fonctionnalités: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-33-generic firmware=8.83.5.1 build 33692 latency=0 link=no multicast=yes wireless=IEEE 802.11
ressources: irq:32 mémoire:f9ffe000-f9ffffff
*-network DÉSACTIVÉ
description: Interface réseau sans fil
identifiant matériel: 3
information bus: usb@2:3
nom logique: wlx94103eea1f43
numéro de série: 94:10:3e:ea:1f:43
fonctionnalités: ethernet physical wireless
configuration: broadcast=yes driver=rtl8192cu driverversion=4.15.0-33-generic firmware=N/A link=no multicast=yes wireless=IEEE 802.11
>> lsmod
Module Size Used by
rtl8xxxu 122880 0
gpio_ich 16384 0
snd_hda_codec_hdmi 49152 1
snd_hda_codec_si3054 16384 1
snd_hda_codec_realtek 106496 1
snd_hda_codec_generic 73728 1 snd_hda_codec_realtek
snd_hda_intel 40960 6
snd_hda_codec 126976 5 snd_hda_intel,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_si3054,snd_hda_codec_realtek
snd_hda_core 81920 6 snd_hda_intel,snd_hda_codec,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_si3054,snd_hda_codec_realtek
snd_hwdep 20480 1 snd_hda_codec
coretemp 16384 0
snd_pcm 98304 5 snd_hda_intel,snd_hda_codec,snd_hda_core,snd_hda_codec_hdmi,snd_hda_codec_si3054
kvm_intel 212992 0
kvm 593920 1 kvm_intel
rtl8192cu 73728 0
rtl_usb 20480 1 rtl8192cu
irqbypass 16384 1 kvm
rtl8192c_common 57344 1 rtl8192cu
snd_seq_midi 16384 0
rtlwifi 77824 3 rtl_usb,rtl8192c_common,rtl8192cu
snd_seq_midi_event 16384 1 snd_seq_midi
snd_rawmidi 32768 1 snd_seq_midi
arc4 16384 4
joydev 24576 0
input_leds 16384 0
serio_raw 16384 0
iwldvm 229376 0
wmi_bmof 16384 0
mac80211 778240 5 rtl_usb,rtlwifi,rtl8192cu,iwldvm,rtl8xxxu
snd_seq 65536 2 snd_seq_midi_event,snd_seq_midi
iwlwifi 282624 1 iwldvm
msi_wmi 16384 0
sparse_keymap 16384 1 msi_wmi
snd_seq_device 16384 3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer 32768 2 snd_seq,snd_pcm
lpc_ich 24576 0
cfg80211 622592 4 iwlwifi,mac80211,rtlwifi,iwldvm
snd 81920 24 snd_hda_intel,snd_hwdep,snd_seq,snd_hda_codec,snd_timer,snd_rawmidi,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_seq_device,snd_hda_codec_si3054,snd_hda_codec_realtek,snd_pcm
soundcore 16384 1 snd
shpchp 36864 0
ir_rc6_decoder 16384 0
rc_rc6_mce 16384 0
ir_lirc_codec 16384 0
lirc_dev 16384 2 ir_lirc_codec
ene_ir 20480 0
rc_core 36864 6 ir_rc6_decoder,rc_rc6_mce,ir_lirc_codec,lirc_dev,ene_ir
mac_hid 16384 0
sch_fq_codel 20480 2
parport_pc 36864 0
ppdev 20480 0
lp 20480 0
parport 49152 3 lp,parport_pc,ppdev
ip_tables 28672 0
x_tables 40960 1 ip_tables
autofs4 40960 2
hid_logitech_hidpp 32768 0
hid_logitech_dj 20480 0
usbhid 49152 0
hid 118784 4 usbhid,hid_logitech_dj,hid_logitech_hidpp
nouveau 1716224 13
mxm_wmi 16384 1 nouveau
i2c_algo_bit 16384 1 nouveau
ttm 106496 1 nouveau
psmouse 147456 0
firewire_ohci 40960 0
ahci 36864 3
drm_kms_helper 172032 1 nouveau
libahci 32768 1 ahci
sdhci_pci 32768 0
sdhci 49152 1 sdhci_pci
firewire_core 65536 1 firewire_ohci
syscopyarea 16384 1 drm_kms_helper
crc_itu_t 16384 1 firewire_core
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
fb_sys_fops 16384 1 drm_kms_helper
r8169 86016 0
mii 16384 1 r8169
drm 401408 16 nouveau,ttm,drm_kms_helper
video 45056 2 msi_wmi,nouveau
wmi 24576 4 wmi_bmof,msi_wmi,mxm_wmi,nouveau
>> iwconfig
wlx94103eea1f43 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:on
wlp5s0 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=off
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
>> ifconfig -a
>> sudo iwlist scan
>> uname -r -m
4.15.0-33-generic x86_64
>> cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
>> nm-tool
>> nmcli dev wifi
IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY
IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY
>> nmcli connection list (< 15.04) ou nmcli connection show (>= 15.04)
NAME UUID TYPE DEVICE
Connexion filaire 1 b990d102-fbf9-37ae-8cd3-d33101cf8566 ethernet enp4s0
>> nmcli connection status
>> sudo rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: yes
1: phy1: Wireless LAN
Soft blocked: no
Hard blocked: no