Bonjour et merci de tes tuyaux, voilà ce qu'a donné le wifi check :
>> lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu 18.04 LTS
Release: 18.04
Codename: bionic
>> lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0bda:b006 Realtek Semiconductor Corp.
Bus 001 Device 006: ID ffff:5678
Bus 001 Device 003: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 002: ID 04f2:b52d Chicony Electronics Co., Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>> lspci -k -nn | grep -A 3 -i net
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
Subsystem: Hewlett-Packard Company RTL8723BE PCIe Wireless Network Adapter [103c:804c]
Kernel driver in use: rtl8723be
Kernel modules: rtl8723be
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 07)
Subsystem: Hewlett-Packard Company RTL810xE PCI Express Fast Ethernet controller [103c:80c5]
Kernel driver in use: r8169
Kernel modules: r8169
>> sudo lshw -C network
*-network
description: Interface réseau sans fil
produit: RTL8723BE PCIe Wireless Network Adapter
fabriquant: Realtek Semiconductor Co., Ltd.
identifiant matériel: 0
information bus: pci@0000:02:00.0
nom logique: wlp2s0
version: 00
numéro de série: 44:1c:a8:56:09:b3
bits: 64 bits
horloge: 33MHz
fonctionnalités: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtl8723be driverversion=4.15.0-126-generic firmware=N/A ip=192.168.43.165 latency=0 link=yes multicast=yes wireless=IEEE 802.11
ressources: irq:18 portE/S:2000(taille=256) mémoire:91200000-91203fff
*-network
description: Ethernet interface
produit: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
fabriquant: Realtek Semiconductor Co., Ltd.
identifiant matériel: 0
information bus: pci@0000:03:00.0
nom logique: enp3s0
version: 07
numéro de série: 70:5a:0f:98:03:d8
taille: 10Mbit/s
capacité: 100Mbit/s
bits: 64 bits
horloge: 33MHz
fonctionnalités: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8106e-1_0.0.1 06/29/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
ressources: irq:19 portE/S:1000(taille=256) mémoire:91100000-91100fff mémoire:91000000-91003fff
>> lsmod | sort
acpi_thermal_rel 16384 1 int3400_thermal
aesni_intel 188416 6
aes_x86_64 20480 1 aesni_intel
ahci 40960 4
arc4 16384 2
autofs4 40960 2
bluetooth 516096 33 btrtl,btintel,btbcm,bnep,btusb,rfcomm
bnep 20480 2
btbcm 16384 1 btusb
btcoexist 126976 1 rtl8723be
btintel 16384 1 btusb
btrfs 1155072 0
btrtl 16384 1 btusb
btusb 45056 0
ccm 20480 9
cfg80211 634880 2 rtlwifi,mac80211
coretemp 16384 0
cpuid 16384 0
crc32_pclmul 16384 0
crct10dif_pclmul 16384 0
cryptd 24576 3 crypto_simd,ghash_clmulni_intel,aesni_intel
crypto_simd 16384 1 aesni_intel
drm 401408 5 drm_kms_helper,i915
drm_kms_helper 172032 1 i915
ecdh_generic 24576 1 bluetooth
fb_sys_fops 16384 1 drm_kms_helper
ghash_clmulni_intel 16384 0
glue_helper 16384 1 aesni_intel
hfs 57344 0
hfsplus 106496 0
hp_wireless 16384 0
hp_wmi 16384 0
i2c_algo_bit 16384 1 i915
i915 1622016 12
input_leds 16384 0
int3400_thermal 16384 0
int3403_thermal 16384 0
int340x_thermal_zone 16384 2 int3403_thermal,processor_thermal_device
intel_cstate 20480 0
intel_int0002_vgpio 16384 1
intel_powerclamp 16384 0
intel_rapl 20480 0
intel_soc_dts_iosf 16384 1 processor_thermal_device
ip_tables 28672 0
irqbypass 16384 1 kvm
jfs 188416 0
joydev 24576 0
kvm 614400 0
libahci 32768 1 ahci
libcrc32c 16384 1 xfs
lp 20480 0
lpc_ich 24576 0
mac80211 786432 3 rtl_pci,rtl8723be,rtlwifi
mac_hid 16384 0
media 40960 2 videodev,uvcvideo
mei 94208 1 mei_txe
mei_txe 20480 0
mii 16384 1 r8169
minix 32768 0
Module Size Used by
msdos 20480 0
nls_iso8859_1 16384 2
ntfs 102400 0
parport 49152 3 parport_pc,lp,ppdev
parport_pc 32768 0
pcbc 16384 0
ppdev 20480 0
processor_thermal_device 16384 0
psmouse 151552 0
punit_atom_debug 16384 0
pwm_lpss 16384 1 pwm_lpss_platform
pwm_lpss_platform 16384 0
qnx4 16384 0
r8169 86016 0
raid6_pq 114688 1 btrfs
rfcomm 77824 4
rtl8723be 98304 0
rtl8723_common 24576 1 rtl8723be
rtl_pci 32768 1 rtl8723be
rtlwifi 77824 4 rtl_pci,rtl8723be,btcoexist,rtl8723_common
sch_fq_codel 20480 6
serio_raw 16384 0
shpchp 36864 0
snd 81920 17 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm,snd_rawmidi
snd_hda_codec 126976 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
snd_hda_codec_generic 73728 1 snd_hda_codec_realtek
snd_hda_codec_hdmi 49152 1
snd_hda_codec_realtek 106496 1
snd_hda_core 81920 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
snd_hda_intel 45056 3
snd_hwdep 20480 1 snd_hda_codec
snd_pcm 98304 4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core
snd_rawmidi 32768 1 snd_seq_midi
snd_seq 65536 2 snd_seq_midi,snd_seq_midi_event
snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_timer 32768 2 snd_seq,snd_pcm
soundcore 16384 1 snd
sparse_keymap 16384 1 hp_wmi
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
uas 24576 0
ufs 77824 0
usb_storage 69632 2 uas
uvcvideo 90112 0
video 45056 1 i915
videobuf2_core 40960 2 videobuf2_v4l2,uvcvideo
videobuf2_memops 16384 1 videobuf2_vmalloc
videobuf2_v4l2 24576 1 uvcvideo
videobuf2_vmalloc 16384 1 uvcvideo
videodev 184320 3 videobuf2_core,videobuf2_v4l2,uvcvideo
wmi 24576 2 hp_wmi,wmi_bmof
wmi_bmof 16384 0
xfs 1204224 0
xor 24576 1 btrfs
x_tables 40960 1 ip_tables
zstd_compress 163840 1 btrfs
>> iwconfig
wlp2s0 IEEE 802.11 ESSID:"Alcatel A7 56980036"
Mode:Managed Frequency:2.442 GHz Access Point: 9E:4F:CF:6A:33:83
Bit Rate=72.2 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:on
Link Quality=46/70 Signal level=-64 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
>> ifconfig -a
>> sudo iwlist scan
wlp2s0 Scan completed :
Cell 01 - Address: 9E:4F:CF:6A:33:83
Channel:7
Frequency:2.442 GHz (Channel 7)
Quality=52/70 Signal level=-58 dBm
Encryption key:on
ESSID:"Alcatel A7 56980036"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000056753cd9b
Extra: Last beacon: 48ms ago
IE: Unknown: 0013416C636174656C204137203536393830303336
IE: Unknown: 010882848B960C121824
IE: Unknown: 030107
IE: Unknown: 32043048606C
IE: Unknown: 2A0100
IE: Unknown: 2D1A300103FF00000000000000000000000100000000000000000000
IE: Unknown: 3D1607000400000000000000000000000000000000000000
IE: Unknown: 7F0100
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F204104A00011010440001021049000600372A000120
IE: Unknown: DD07000CE708000000
>> uname -r -m
4.15.0-126-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
* Alcatel A7 56980036 Infra 7 65 Mbit/s 60 ▂▄▆_ WPA2
>> nmcli connection list (< 15.04) ou nmcli connection show (>= 15.04)
NAME UUID TYPE DEVICE
Alcatel A7 56980036 d3f9c4b1-5707-4069-b74c-b4adc59778b7 wifi wlp2s0
Alcatel A7 97cdfadd-3b85-4f57-b0da-8a2bd1b1b352 wifi --
Bbox-785FB7FA 4f4dc832-fcc0-4333-88ea-dc949922a402 wifi --
Connexion filaire 1 71b47bcd-fe5f-31f6-ab81-97b2bbe749f7 ethernet --
Livebox-CE74 998ee38a-f4b8-4fee-9738-0946f637b208 wifi --
freebox_QQUSAE 6f6194bd-00b0-4623-a3c6-ea28f989a858 wifi --
michou de konoha 732e9b1e-ab4c-4e9a-97c4-3303f8244a25 wifi --
>> sudo rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no