The original thread is here: Restored Realtek Adapter Operation
The Realtek adapter had worked for 3-4 months after a 20.04.1 install until a Nov ubuntu 20.04.1 upgrade. It stopped working immediately afterwards. Following the advice in the first thread, was able to restore operation and it was believed that the DKMS installation would prevent failure in future. But it failed again a few days ago. After an upgrade. I have 2 nearly identical computers and it has been fixed in #2, but not in this computer #1, and I've been asked to post some tests:
rtl8188fu, 1.0, 5.4.0-52-generic, x86_64: installed rtl8812AU_8821AU_linux, 1.0, 5.4.0-52-generic, x86_64: installed
sudo lshw -C network
[sudo] password for jim-hitek: *-network description: Ethernet interface product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:01:00.0 logical name: enp1s0 version: 11 serial: 10:c3:7b:9d:af:b3 capacity: 1Gbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=r8169 firmware=rtl8168g-2_0.0.1 02/06/13 latency=0 link=no multicast=yes port=MII resources: irq:40 ioport:e000(size=256) memory:fea00000-fea00fff memory:d0800000-d0803fff *-network description: Wireless interface physical id: 1 bus info: usb@2:1 logical name: wlx1cbfce112175 serial: 1c:bf:ce:11:21:75 capabilities: ethernet physical wireless configuration: broadcast=yes driver=rt2800usb driverversion=5.4.0-52-generic firmware=0.36 ip=192.168.43.108 link=yes multicast=yes wireless=IEEE 802.11
Bus 002 Device 006: ID 0bda:a811 Realtek Semiconductor Corp. RTL8811AU 802.11a/b/g/n/ac WLAN Adapter Bus 002 Device 005: ID 05e3:0608 Genesys Logic, Inc. Hub Bus 002 Device 007: ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 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 003 Device 003: ID 1267:0103 Logic3 / SpectraVideo plc G-720 Keyboard Bus 003 Device 002: ID 275d:0ba6 USB OPTICAL MOUSE Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 007 Device 002: ID 058f:9254 Alcor Micro Corp. Hub Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
On this computer, that I call #1, the Realtek does not work. On my other computer, that I call #2, operation has been restored following the instructions shown at the link. I believe what the experts are trying to figure out is why didn't installing DKMS protect the Realtek drivers through the upgrade?