New ubuntu 18.04 installation - wireless dongle issue

[riggster]

This is my first experience with Linux. I used DBAN to wipe the hard drive on a computer and installed Ubuntu 18.04 from a USB bootable drive. The installation seemed to work fine, but in the wireless settings, it says "no wifi adapter found". I have done some reading online and this is the information I have:

I only have the usb wifi dongle, no other way to connect the computer to the internet. The computer does have a ethernet port, but I only have access to the internet via wifi.

The first time I installed the OS, I forgot to check the button that says to install third party software for wifi devices, or something to that effect. I re-installed, and made sure to check that box, and that did not change anything.

When I open a terminal and type

lsusb

, I get the following line that relates to my dongle. I know this is the correct line, because it does not show up when I remove the dongle and run lsusb again.

Bus 002 Device 005: ID 0bda:c811 Realtek Semiconductor Corp.

when I type

sudo lshw -C network

, the only network device that is listed has the following information:

description: Ethernet interface
product: 82579LM Gigabit Network Connection
vendor: Intel Corporation
bus info: pci@0000:00:19.0

can someone help me figure this out? Thanks a ton!

Riggster

[wildmanne39]

Thread moved to Networking & Wireless a more appropriate sub-forum.

[chili555]

I only have the usb wifi dongle, no other way to connect the computer to the internet.

Can you tether your phone?

Do you still have the original installation disk? If you can't tether, many of the packages we'll need to compile a driver are on it.

[riggster]

I can't tether my phone, and I don't have the original disk. I do have access to the internet through my windows laptop though, or if I need to I will find a way to get it hard wired.

[riggster]

Internet connectivity solved. I bought a cat5 cable and am set up in my storage room plugged into the back of my router.

[jeremy31]

See https://github.com/whitebatman2/rtl8821CU
You will need to have Secure Boot disabled if you have an UEFI install

[chili555]

Here is the exact procedure: https://askubuntu.com/questions/1089...090069#1090069

You will probably also need to install a few prerequisites:

sudo apt-get install git dkms build-essential linux-headers-generic

Post back if you get stuck or need additional guidance.

Thanks, Jeremy.

[riggster]

I ran the command:

sudo mokutil --disable-validation

and got the following output: This system doesn't support Secure Boot

So, It looks like I don't need to disable Secure Boot.

When I execute

sudo apt-get install dkms

I was asked to insert a disc into my cd-rom labeled
'Ubuntu 18.04.2 LTS _Bionic Beaver_ - Release amd64 (20190210)'.
I don't have this disc. Do you have any suggestions? I have included the entire output of the command below.


Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
build-essential dpkg-dev fakeroot g++ g++-7 gcc gcc-7 libalgorithm-diff-perl
libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan4 libatomic1
libc-dev-bin libc6-dev libcilkrts5 libfakeroot libgcc-7-dev libitm1 liblsan0
libmpx2 libquadmath0 libstdc++-7-dev libtsan0 libubsan0 linux-libc-dev make
manpages-dev
Suggested packages:
menu debian-keyring g++-multilib g++-7-multilib gcc-7-doc libstdc++6-7-dbg
gcc-multilib autoconf automake libtool flex bison gcc-doc gcc-7-multilib
gcc-7-locales libgcc1-dbg libgomp1-dbg libitm1-dbg libatomic1-dbg
libasan4-dbg liblsan0-dbg libtsan0-dbg libubsan0-dbg libcilkrts5-dbg
libmpx2-dbg libquadmath0-dbg glibc-doc libstdc++-7-doc make-doc
The following NEW packages will be installed:
build-essential dkms dpkg-dev fakeroot g++ g++-7 gcc gcc-7
libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl
libasan4 libatomic1 libc-dev-bin libc6-dev libcilkrts5 libfakeroot
libgcc-7-dev libitm1 liblsan0 libmpx2 libquadmath0 libstdc++-7-dev libtsan0
libubsan0 linux-libc-dev make manpages-dev
0 upgraded, 28 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/26.9 MB of archives.
After this operation, 117 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Media change: please insert the disc labeled
'Ubuntu 18.04.2 LTS _Bionic Beaver_ - Release amd64 (20190210)'
in the drive '/cdrom/' and press [Enter]



Also, I tried to go ahead and clone the github repo, but I didn't have git installed. When I execute

sudo apt install git

, the command failed because of an uninstallable dependency (liberror-perl). See the output below:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
git : Depends: liberror-perl but it is not installable
E: Unable to correct problems, you have held broken packages.

Any suggestions on this problem?

[chili555]

Please open Software and Updates and then disable the CDROM. Be certin that main, universe, restricted and multiverse are enabled. You should be prompted to update the package index; do so. Next, open the terminal and run:

sudo apt-get update
sudo apt-get install git dkms build-essential linux-headers-generic

Then proceed with installing the actual driver.

[riggster]

I was able to work through all the steps, but in the wifi settings it still says a wifi adapter isn't being detected. Rebooting didn't help either.