I had a Linksys WUSB 6300 dual-band USB WiFi adapter happily running on on my desktop PC with driver module 8812AU.
When I first got it to work I used the driver signing method to get it to work with Secure Boot. It worked fine with Kernel version 4.4.0-23-generic and later also with 4.4.0-24-generic where I resigned it after the update.
After the update to 4.4.0-28-generic resigning for some reason does not have the desired effect anymore and it does not seem to load the driver module 8812AU.
After updating to 4.4.0-38-generic the behavior remains the same.
The Additional Drivers tool now shows me this, so I am not sure if somehow the module files got messed up. I am pretty new to Ubuntu, so I wouldn't know how to tell.
When it was still working it showed me this.
So in consequence the network adapter is not working and I am out of ideas what to check or do in order to get it back to work.
lsusb shows me that the adapter is recognized as USB device:
Bus 002 Device 002: ID 13b1:003f Linksys WUSB6300 802.11a/b/g/n/ac Wireless Adapter [Realtek RTL8812AU]
sudo lshw -C network only shows me the Ethernet and the internal WiFi (it has a very similar name). It is an integrated WiFi adapter which is working poorly under Ubuntu and is thus not useful for me.
Note: 8821AE is the internal WiFi. I am trying to get 8812AU to run which is not listed here because it does not seem to be loaded.
*-network description: Ethernet interface product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:03:00.0 logical name: enp3s0 version: 11 serial: 54:a0:50:d5:4b:0b size: 10Mbit/s 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 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168g-2_0.0.1 02/06/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s resources: irq:42 ioport:e000(size=256) memory:f7d00000-f7d00fff memory:f0000000-f0003fff *-network description: Wireless interface product: RTL8821AE 802.11ac PCIe Wireless Network Adapter vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:04:00.0 logical name: wlp4s0 version: 00 serial: 54:27:1e:d6:91:8d width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=rtl8821ae driverversion=4.4.0-22-generic firmware=N/A ip=192.168.0.20 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn resources: irq:46 ioport:d000(size=256) memory:f7c00000-f7c03fff
rfkill list all shows that nothing seems to be blocked:
0: hci0: Bluetooth Soft blocked: no Hard blocked: no 1: phy0: Wireless LAN Soft blocked: no Hard blocked: no
Any help would be greatly appreciated!