Driver for RTL8811 Wireless Adapter for Ubuntu 18.04

[rolfrenne]

Thank you very much for your helpful post chili,
it has been working for me a long time. But with the kernel update to 4.15.0-55-generic-x86-64 it stopped working, I tried to reinstall (after removing) using your instruction again, but failed.
Now I'm running 4.15.0-54 again, with no problems.
Hoping either the next kernel will work with rtl8821CU-5.2.5.3 or an other solution will be posted.

[chili555]

Thank you very much for your helpful post chili,
it has been working for me a long time. But with the kernel update to 4.15.0-55-generic-x86-64 it stopped working, I tried to reinstall (after removing) using your instruction again, but failed.
Now I'm running 4.15.0-54 again, with no problems.
Hoping either the next kernel will work with rtl8821CU-5.2.5.3 or an other solution will be posted.

Please run and post:

sudo dkms status

Usually, when the build fails for a particular kernel version, details can be found in the make.log. I suspect it will be in /var/lib/dkms/rtl8821CU/5.2.5.3/4.15.0-55-generic/x86_64/log/make.log. Please show us:

cat  /var/lib/dkms/rtl8821CU/5.2.5.3/4.15.0-55-generic/x86_64/log/make.log

[rolfrenne]

Thank you very much for the quick response, but I'm sorry, I've purged 4.15.0-55, and there is no /var/lib/dkms/rtl8821CU/5.2.5.3/4.15.0-55-generic/ any more, but I'll report results with the next kernel update.

[bastian2001]

I've been struggling to get this to work for a couple of days now and I still do.
lsusb gives:

Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 046a:b103 Cherry GmbH 
Bus 001 Device 002: ID 0bda:c811 Realtek Semiconductor Corp. 
Bus 001 Device 004: ID 046a:0023 Cherry GmbH CyMotion Master Linux Keyboard G230
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

So the device is found.

I'm using Linux Mint 19.1 so I apologize if this is the wrong forum. I tried different kernels versions: 5.2.5-050205-generic (x86_64) and 4.20.17-042017-generic (x86_64)

Everything mentioned works except

sudo dkms build -m ${DRV_NAME} -v ${DRV_VERSION}

.
I get

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area...
'make' KVER=4.20.17-042017-generic..........(bad exit status: 2)
ERROR (dkms apport): binary package for rtl8821CU: 5.2.5.3 not found
Error! Bad return status for module build on kernel: 4.20.17-042017-generic (x86_64)
Consult /var/lib/dkms/rtl8821CU/5.2.5.3/build/make.log for more information.

as the output (same output on both versions except the kernel version listed).

In the make.log file it says

cc1: some warnings being treated as errors
scripts/Makefile.build:291: recipe for target '/var/lib/dkms/rtl8821CU/5.2.5.3/build/os_dep/linux/ioctl_cfg80211.o' failed
make[2]: *** [/var/lib/dkms/rtl8821CU/5.2.5.3/build/os_dep/linux/ioctl_cfg80211.o] Error 1
Makefile:1562: recipe for target '_module_/var/lib/dkms/rtl8821CU/5.2.5.3/build' failed
make[1]: *** [_module_/var/lib/dkms/rtl8821CU/5.2.5.3/build] Error 2
make[1]: Verzeichnis „/usr/src/linux-headers-4.20.17-042017-generic“ wird verlassen
Makefile:1923: recipe for target 'modules' failed
make: *** [modules] Error 2

in addition to a lot of -Werrors.

Any idea?

[chili555]

I've been struggling to get this to work for a couple of days now and I still do.
<snip>
in addition to a lot of -Werrors.

Any idea?

We don't know much about Mint or the 4.20 kernel here. I recommend that you ask here: https://forums.linuxmint.com/viewforum.php?f=53

[fuul2]

Hi, i have a problem i received this Errors:

xx@xx:~/rtl8821CU$ sudo dkms build -m ${DRV_NAME} -v ${DRV_VERSION}

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area...
'make' KVER=5.0.0-25-generic.........(bad exit status: 2)
ERROR (dkms apport): binary package for rtl8821CU: 5.2.5.3 not found
Error! Bad return status for module build on kernel: 5.0.0-25-generic (x86_64)
Consult /var/lib/dkms/rtl8821CU/5.2.5.3/build/make.log for more information.
xx@xx:~/rtl8821CU$ sudo dkms install -m ${DRV_NAME} -v ${DRV_VERSION}

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area...
'make' KVER=5.0.0-25-generic.........(bad exit status: 2)
ERROR (dkms apport): binary package for rtl8821CU: 5.2.5.3 not found
Error! Bad return status for module build on kernel: 5.0.0-25-generic (x86_64)
Consult /var/lib/dkms/rtl8821CU/5.2.5.3/build/make.log for more information.

Thx for help

[chili555]

Hi, i have a problem i received this Errors:

xx@xx:~/rtl8821CU$ sudo dkms build -m ${DRV_NAME} -v ${DRV_VERSION}

<snip>
Consult /var/lib/dkms/rtl8821CU/5.2.5.3/build/make.log for more information.

Thx for help

Please try this method instead: https://askubuntu.com/questions/1164...164982#1164982

[fuul2]

Yeah thx very much,

sudo apt update
sudo apt install build-essential git dkms
git clone https://github.com/brektrou/rtl8821CU.git
cd rtl8821CU
chmod +x dkms-install.sh
sudo ./dkms-install.sh
sudo modprobe 8821cu

Now it works.

[pazystamas2]

Hello,
How to disable usb wifi adapter auto mount? After boot, nautilus auto mounts wifi as usb disk (with windows drivers) and wifi only works after unmounting disk. I don't want to disable all flash disk mounting, only this wifi adapter. Ubuntu 19.04

[chili555]

Hello,
How to disable usb wifi adapter auto mount? After boot, nautilus auto mounts wifi as usb disk (with windows drivers) and wifi only works after unmounting disk. I don't want to disable all flash disk mounting, only this wifi adapter. Ubuntu 19.04

Please start your own new thread and include the results of these terminal commands:

lsusb
sudo dpkg -s usb-modeswitch | grep Status