[SOLVED] Upgrading to Debian 10 Buster (stable) broke WiFi/networking
by boughtonp from LinuxQuestions.org on (#4VZCK)
Yesterday I upgraded from Debian 8 to 9 with no apparent issues.
Today I upgraded from 9 to 10 and as I think I'm done and do "apt update" to check it suddenly can't connect, (and after rebooting I discover I've only got CLI access, but I'll address that separately).
Code:# ping debian.org
ping: debian.org: Temporary failure in name resolution
# ping 192.168.0.1
connect: Network is unreachableCode:# cat /etc/network/interfaces
# This file describes the network interfaces... <snip>
source /etc/network/interfaces.d/*
# The looopback network interface
auto lo
iface lo inet loopback
Code:# ip add
...
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 58:94:6b:3b:09:54 brd ff:ff:ff:ff:ff:ffCode:#lspci -nnk | grep -A 3 -i network
00:19.0 Ethernet controller [0200]: Intel Corporation 82577LMN Gigabit Network Connection [8086:10ea] (rev 06)
Subsystem: Lenovo 82577LM Gigabit Network Connection [17aa:2153]
Kernel driver in use: e1000e
Kernel modules: e1000e
00:1a.0 USB Controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhances Host Controller [8086:3b3c] (rev 06)
--
02:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6200 [8086:4239] (rev 35)
Subsystem: Intel Corporation Centrino Advanced-N 6200 2x2 AGN [8086:1311]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi, wl
I found a thread where someone with a similar issue said booting into a previous kernel version helped - that wasn't the case for me, selecting the only previous kernel option didn't help.
Another thread has error messages in dmesg logs - my /var/log/dmesg is an empty file. (I tried the suggested symlink just in case but that didn't fix it.)
If I run:
Code:ifconfig wlan0 up
iwlist wlan0 scan | grep -i ssidIt results in Code:ESSID:"NetworkName"So it seems the interface can see networks, but isn't connecting.
There is no file at /etc/wpa_supplicant/wpa_supplicant.conf but neither is there in my other (working) machine, so not sure if that file is still relevant, but I tried creating it following the commands in this guide but still no luck.
Today I upgraded from 9 to 10 and as I think I'm done and do "apt update" to check it suddenly can't connect, (and after rebooting I discover I've only got CLI access, but I'll address that separately).
Code:# ping debian.org
ping: debian.org: Temporary failure in name resolution
# ping 192.168.0.1
connect: Network is unreachableCode:# cat /etc/network/interfaces
# This file describes the network interfaces... <snip>
source /etc/network/interfaces.d/*
# The looopback network interface
auto lo
iface lo inet loopback
Code:# ip add
...
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 58:94:6b:3b:09:54 brd ff:ff:ff:ff:ff:ffCode:#lspci -nnk | grep -A 3 -i network
00:19.0 Ethernet controller [0200]: Intel Corporation 82577LMN Gigabit Network Connection [8086:10ea] (rev 06)
Subsystem: Lenovo 82577LM Gigabit Network Connection [17aa:2153]
Kernel driver in use: e1000e
Kernel modules: e1000e
00:1a.0 USB Controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhances Host Controller [8086:3b3c] (rev 06)
--
02:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6200 [8086:4239] (rev 35)
Subsystem: Intel Corporation Centrino Advanced-N 6200 2x2 AGN [8086:1311]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi, wl
I found a thread where someone with a similar issue said booting into a previous kernel version helped - that wasn't the case for me, selecting the only previous kernel option didn't help.
Another thread has error messages in dmesg logs - my /var/log/dmesg is an empty file. (I tried the suggested symlink just in case but that didn't fix it.)
If I run:
Code:ifconfig wlan0 up
iwlist wlan0 scan | grep -i ssidIt results in Code:ESSID:"NetworkName"So it seems the interface can see networks, but isn't connecting.
There is no file at /etc/wpa_supplicant/wpa_supplicant.conf but neither is there in my other (working) machine, so not sure if that file is still relevant, but I tried creating it following the commands in this guide but still no luck.