Score:3

Ubuntu

Can't use internet because networkmanager has disappeared !! (Ubuntu 20.04 LTS)

Sarahneedshelp

6/25/23, 9:49 PM

I need help, and it is quite urgent. I had connections issues (my Wi-Fi connection kept disconnecting)

So I followed what a member of this community recommended, in a similar post written by a fellow member

I entered these commands in a shell

sudo apt-get purge network-manager 
sudo apt-get update 
sudo apt-get autoremove 
sudo apt-get upgrade 
sudo apt-get install network-manager 
sudo apt install ubuntu-desktop

And now... I don't see any wifi parameters. I can't connect to the internet...

How can I fix this?

Here is what I get when i type sudo dmesg | grep wlo1

0 + 0

network-manager

internet

connection

cocomac

6/25/23, 10:02 PM

Well, that uninstalls network-manager (breaking your network access), then tries to update the package repo, which fails due to no internet access. So... that is either missing context of plain wrong. Where did you see that?

chili555

6/25/23, 10:07 PM

Do you still have a wireless interface? Please edit your question to show the result of the terminal command: `iwconfig | head -3` Welcome to Ask Ubuntu.

Sarahneedshelp

6/25/23, 10:09 PM

Thanks for your help. When i enter your command chili555, i get : lo no wireless extension enx0c5.. no wireless extension wlo1 ieee 802.11 essid off/any mode managed access point not associated tx-power=0 dBm retry short limit:7 rts thr:off fragment thr:off

crip659

6/25/23, 10:11 PM

I remember doing that a long time ago. Not sure now if I used the CD to install, or had to download network manager on another computer.

Sarahneedshelp

6/25/23, 10:14 PM

Besides my computer, I have two more devices right now a smartphone with an usb cable, and a usb pluggable 4g modem

Sarahneedshelp

6/25/23, 10:17 PM

Bluetooth connection of my computer is still working. Could that help?

ChanganAuto

6/25/23, 10:22 PM

*Could that help?* Theoretically yes. If you can connect to a Bluetooth tethered network from your smartphone it may be enough to install/reinstall what you need. But speeds will be atrocious let alone stability.

Sarahneedshelp

6/25/23, 10:23 PM

My laptop and smartphone are paired. My smartphone isbconnected to internet. What should i do to share my internet connection to my laptop please ? Is there à command to enter ?

Sarahneedshelp

6/25/23, 10:25 PM

I use Ubuntu 20.04 LTS

Sarahneedshelp

6/25/23, 10:30 PM

What other information do you need guiverc?

Score:5

Ubuntu

chili555

6/25/23, 10:35 PM

In the absense of Network Manager, I suggest that you use netplan. From the terminal, do:

ls /etc/netplan

Find out the name of the file. Make a backup as you will need it after reinstalling NM:

sudo mv /etc/netplan/<file_you_found>.yaml /etc/netplan/<file_you_found>.bak

Now, let’s create a new file:

sudo nano /etc/netplan/config.yaml

Write the file to read:

network:
  version: 2
  renderer: networkd
  wifis:
    wlo1:
      dhcp4: yes
      dhcp6: yes
      access-points:
        "network_ssid_name":
          password: "**********"

Of course, substitute your details here. Note that the network name and password are enclosed in quotes “.

Netplan is very specific about spacing, indentation, etc., so proofread carefully twice. Save (Ctrrl+o followed by Enter) and exit nano (Ctrl+x followed by Enter).

Follow with:

sudo netplan generate
sudo netplan apply

Did you connect?

iwconfig
ping -c3 www.ubuntu.com

It might take a reboot.

If you are connected, reinstall NM:

sudo apt update 
sudo apt install –reinstall network-manager ubuntu-desktop

Reboot and tell us if there is any improvement. If so, I will edit this answer to revert netplan.

EDIT: Now that you are connected and have reinstalled Network Manager, we should revert the netplan file to again refer to NM.

Please do:

 ls /etc/netplan

I assume that the file you backed up is /etc/netplan/01-network-manager-all.bak

If so, first back up the file you just created above:

sudo mv /etc/netplan/config.yaml  /etc/netplan/config.bak

And restore the previous file:

sudo mv /etc/netplan/01-network-manager-all.bak  /etc/netplan/01-network-manager-all.yaml

Follow with:

sudo netplan generate
sudo netplan apply

You should be all set.

0 + 0

Sarahneedshelp

6/25/23, 11:10 PM

Thanks very much for your help. Im trying

heynnema

6/25/23, 11:25 PM

Excellent answer! +1

Sarahneedshelp

6/25/23, 11:38 PM

So i followed what you adviced me to do. For some reason, its not working is there a way to re open file that i have just created to make sure that i made no mistake please?

chili555

6/25/23, 11:41 PM

Sure, simply reopen with nano and save and exit as I outlined above.

Sarahneedshelp

6/25/23, 11:50 PM

Thanks ! I added an extra space and now that k have fixed it, there are changes. When i type iwconfig i see my ssid name and other information but i the ping command is not working

chili555

6/25/23, 11:53 PM

Please run and edit your question to show: `sudo dmesg | grep wlo1`

Sarahneedshelp

6/26/23, 12:14 AM

So i have taken a picture of my screen and updated my original post to show you what i get. it would have taken too much time to type everything. Im sorry the picture is wrongly rotated

chili555

6/26/23, 12:20 AM

The wireless appears to be roaming from among two access points; evidently with the same name! This is typical of 2.4gHz and 5 gHz segments of a router. Is it possible to rename them to myrouter2.4 and my router5 or some such. Then you'd meed to amend the netplan file to specify which.

Sarahneedshelp

6/26/23, 12:23 AM

I have just tried with another device and its working ! THANKS A LOT. You have all my respect :')

chili555

6/26/23, 12:27 AM

Awesome! Glad it's working. If my answer has been helpful, please accept it: https://askubuntu.com/tour The searchers will appreciate it.

Sarahneedshelp

6/26/23, 12:29 AM

Sure, I will. Really thanks Again. So i have just réinstalled network manager but it does not detect my other wifi network which used to appear in the wifi liste :/ and the interface seems a bit different

chili555

6/26/23, 12:33 AM

Does it appear if you do: `nmcli device wifi rescan` and follow with: `nmcli device wifi list` ?

Sarahneedshelp

6/26/23, 12:36 AM

It says scanning not allowed While unavailable or activating. By the way it seems that The only wifi connection that I can use is the one I put in the nano file apparently

chili555

6/26/23, 12:38 AM

Ahhh! We need to, as I mentioned in my answer, revert the netplan file. I shall write an edit in a few moments.

Sarahneedshelp

6/26/23, 12:53 AM

THANKS A LOT CHILI555 YOU ROCK. I WISH YOU ALL THE BEST FOR THE FUTURE. TAKE CARE !!

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Can't use internet because networkmanager has disappeared !! (Ubuntu 20.04 LTS)

TH: ใช้เน็ตไม่ได้เพราะnetworkmanagerหาย!! (อูบุนตู 20.04 LTS)

RO: Nu pot folosi internetul deoarece networkmanager a dispărut !! (Ubuntu 20.04 LTS)

RU: Не могу использовать Интернет, потому что networkmanager исчез!! (Убунту 20.04 ЛТС)

VI: Không thể sử dụng internet vì networkmanager đã biến mất!! (Ubuntu 20.04 LTS)

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