new update of Ubuntu Focal Fossa does not recognize any Wifi network

[Diego Banfi]

When the system was upgraded to Ubuntu version 20.04, WiFi stopped working. It does not recognize any network, or it does recognize it when the computer is turned on but soon after it stops recognizing it and the connection is lost, so there is no other option but to use the Internet connected with an Ethernet cable.

The solution I found to this problem is to select from grub the Kernel versions that did not have this problem (5.3). That worked fine so far, but yesterday the kernel was updated again, and the system removed the 5.3 kernel working versions, so I can no longer select them from grub.
It only left several versions 5.4.0, which all have this same problem

I downloaded the packages of various kernel 5.3.0 versions (headers, modules and image) from https://packages.ubuntu.com/, and I can get them up fine from grub, but when I do this, for some reason the computer works very badly (the screens take time to load, the mouse moves slowly, the machine works slowly, not all the menu options appear, etc)

diego@infra-ThinkPad-E490:~$ lsb_release -rd
Description: Ubuntu 20.04.1 LTS
Release: 20.04

diego@infra-ThinkPad-E490:~$ apt-cache policy pkgname
N: Unable to locate package pkgname

#Computer specs:

infra-thinkpad-e490
    description: Computer
    width: 64 bits
    capabilities: smp vsyscall32
  *-core
       description: Motherboard
       physical id: 0
     *-memory
          description: System memory
          physical id: 0
          size: 15GiB
     *-cpu
          product: Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz
          vendor: Intel Corp.
          physical id: 1
          bus info: cpu@0
          size: 3855MHz
          capacity: 4600MHz
          width: 64 bits
     *-network
                description: Ethernet interface
                product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
                vendor: Realtek Semiconductor Co., Ltd.
                physical id: 0
                bus info: pci@0000:04:00.0
                logical name: enp4s0
                version: 10
                serial: e8:6a:64:e7:ea:91
                capacity: 1Gbit/s
                width: 64 bits
                clock: 33MHz
                capabilities: bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.048.00-NAPI latency=0 link=no multicast=yes port=twisted
pair
                resources: irq:125 ioport:3000(size=256) memory:a1304000-a1304fff memory:a1300000-a1303fff

      *-generic
                description: Wireless interface
                product: RTL8822BE 802.11a/b/g/n/ac WiFi adapter
                vendor: Realtek Semiconductor Co., Ltd.
                physical id: 0
                bus info: pci@0000:05:00.0
                logical name: wlp5s0
                version: ff
                serial: f8:a2:d6:f2:20:f9
                width: 32 bits
                clock: 66MHz
                capabilities: bus_master vga_palette cap_list ethernet physical wireless
                configuration: broadcast=yes driver=rtw_pci driverversion=5.4.0-47-generic firmware=N/A latency=255 link=no maxlatency=255 mingnt=255
multicast=yes wireless=IEEE 802.11
                resources: irq:138 ioport:2000(size=256) memory:a1200000-a120ffff

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.25
ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep 13 20:29:04 2020
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to focal on 2020-08-12 (32 days ago)
VarLogDistupgradeApttermlog: Error: [Errno 13] Permission denied: '/var/log/dist-upgrade/apt-term.log'
VarLogDistupgradeTermlog:

[Daniel Letzeisen (dtl131)]

[ 3794.072589] rtw_pci 0000:05:00.0: failed to read ASPM, ret=-5
[ 3796.246698] rtw_pci 0000:05:00.0: failed to poll offset=0x5 mask=0x2 value=0x0
[ 3796.246705] rtw_pci 0000:05:00.0: mac power on failed
[ 3796.246706] rtw_pci 0000:05:00.0: failed to power on mac
[ 3796.246707] rtw_pci 0000:05:00.0: leave idle state failed
[ 3796.246838] rtw_pci 0000:05:00.0: failed to leave ips state
[ 3796.246840] rtw_pci 0000:05:00.0: failed to leave idle state

https://ubuntuforums.org/showthread.php?t=2449632
Specifically, see if the suggestion here helps: https://ubuntuforums.org/showthread.php?t=2449632&p=13984825#post13984825

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.