Ubuntu 18.04 no Wifi adapter found RLT8821CE

[mitchubishi21]

sorry to bother you all, I just cant seem to find the answer. I have an HP pavilion x360 I just finished installing Ubuntu. I really like it but I cannot get the wifi working for the life of me.

The network controller is Realtek semiconductor RLT8821CE 80211ac pcie wireless network adapter. Please help!!

[chili555]

Please check here: https://askubuntu.com/questions/9903...071336#1071336

[mitchubishi21]

when I try this code it works until I get to the chmod lines of code
nothing happens when I hit enter. I type chmod +x dkms -install.sh and the terminal doesnt do anything

[mitchubishi21]

Sorry, I am pretty linux illiterate:/

[chili555]

In this context, no response means, roughly, “Command executed as ordered. I have no errors or warnings to report. Next?”

Please proceed. You are doing fine so far.


EDIT: For your benefit and others that may browse this thread, this command:

 chmod +x dkms -install.sh

Means, roughly, 'change the mode of the file to make it executable' that is, so it can run and do things.

For an example, let's list all the attributes of some file:

chili@T440p:~$ ls -al some_file
-rw-r--r-- 1 chili chili 13 Sep  5 09:28 some_file

Now let's make the file executable:

chmod +x some_file

And when we check its attributes again, we see:

-rwxr-xr-x 1 chili chili 13 Sep  5 09:28 some_file

Previously, the file was readable and writeable; now it is readable, writable and executable. That's the meaning of the x's in the attributes.

The change in mode is required for the file dkms-install.sh because you are, in the next steps, going to ask it to do something important; install your driver!

[mitchubishi21]

Chili you are the best! thank you. Now, the wifi networks are getting connected but disconnecting over and over again. any idea how to fix that?

[chili555]

Let's turn off power saving in Network Manager to see if it helps; from the terminal:

sudo sed -i 's/3/2/' /etc/NetworkManager/conf.d/*

And restart NM:

sudo service network-manager restart

Any improvement?

Quite often, in Linux drivers, the router settings can be tweaked to give better performance.

First, check the settings in the router. WPA2-AES is preferred; not any WPA and WPA2 mixed mode and certainly not TKIP. Second, if your router is capable of N speeds, you may have better connectivity with a channel width of 20 MHz in the 2.4 GHz band instead of automatic 20/40 MHz, although it is likely to affect N speeds. I also have better luck with a fixed channel, either 1, 6 or 11, rather than automatic channel selection. Also, be certain the router is not set to use N speeds only; auto B, G and N is preferred. After making these changes, reboot the router.

Then set your regulatory domain explicitly. Check yours:

sudo iw reg get

If you get 00, that is a one-size-maybe-fits-all setting. Find yours here: http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 Then set it temporarily:

sudo iw reg set IS

Of course, substitute your country code if not Iceland. Set it permanently:

sudo nano /etc/default/crda

Change the last line to read:

REGDOMAIN=IS

Proofread carefully, save (Ctrl+o followed by Enter) and close (Ctrl+x) the text editor.

[mitchubishi21]

Its Working now! you are such an amazing help!! How do you know so much?! haha

[chili555]

Glad it's working!

What little I know, I have gleaned in working with Linux here and on other forums almost every day for only about fifteen years!

Have fun!