removed network-manager from ubuntu 18.04

Question

I accidentally removed the network-manager from my ubuntu 18.04 machine. Now I can't connect to internet. My Wifi and wired connection interface got removed and without internet I cant reinstall them. What would I Do now? Please help!

Here is the output of the command nmcli device

DEVICE  TYPE      STATE      CONNECTION 

wlp3s0  wifi      connected  Room-419   
enp2s0  ethernet  unmanaged  --         
lo      loopback  unmanaged  --         
ppp0    ppp       unmanaged  --

If you removed just the package, you can download it from a different computer and transfer it via USB. Or you can download it on your phone and use bluetooth. In either case, use sudo dpkg -i *deb to install it. — avisitoritseems, Apr 16 '19 at 19:02

N0rbert · Answer 1 · 2019-04-16T18:47:59.677

2

You need to connect via Ethernet cable to the network with DHCP server (dynamic IP addresses).

Then run DHCP client manually with sudo dhclient Tab (for auto-completion) and click Enter.
On my system the complete command is sudo dhclient enp0s3

Note: if unsure then run ip link and you will find at least two interfaces here:

$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether aa:bb:cc:dd:ee:01 brd ff:ff:ff:ff:ff:ff

and you will find ethernet as enp0s3 (may vary in your case). Ensure that you can ping some server on the net - for example ping ubuntu.com. If you cannot ping - then try with other (third) ethernet interface.

Then install manager to the system:

sudo apt-get install network-manager # for console
sudo apt-get install network-manager-gnome # for GNOME and Unity desktops

and then reboot.

edited Apr 16 '19 at 18:47

answered Apr 16 '19 at 18:42

N0rbert

99,918

Fixed! I was thinking about installing ubuntu again. thanks! I am grateful. – Mr. Tripple M. Apr 17 '19 at 09:05
Great! So you can accept my answer :) – N0rbert Apr 17 '19 at 09:10
yeah obviously! but I have some issues till now. such as I can not go to the settings on my ubuntu. I did everything as you said but there is no wired connecion available. I can not use the inter by plugging in the ethernet cable which is connected to my router – Mr. Tripple M. Apr 17 '19 at 17:50
Which desktop environment did you use before uninstalling network manager? – N0rbert Apr 17 '19 at 18:16
I used Gnome. I still use it. – Mr. Tripple M. Apr 17 '19 at 18:47
Then try to add new ethernet connection from nm-connection-editor. Specify Device on the Ethernet tab and click Save. – N0rbert Apr 17 '19 at 18:51
nothing changes even I added an ethernet connection. I – Mr. Tripple M. Apr 17 '19 at 19:07
Then please add output of nmcli device to the question. – N0rbert Apr 17 '19 at 19:09
I do not know the history of your system. The final solution may vary if you previously have netplan of ifupdown enabled or something similar. See https://askubuntu.com/a/1115132/66509 as a possible solution. – N0rbert Apr 17 '19 at 19:55

removed network-manager from ubuntu 18.04

1 Answers1