Unfortunately, I uninstalled
sudo apt-get remove --purge network-manager. I was trying to reinstall it from but without internet connection I cannot do so. What is the solution for this?
Unfortunately, I uninstalled
sudo dhclient eth0
then you will have internet and you can use...
sudo apt-get install network-manager
If you've recently upgraded your network manager you can use
sudo apt-get install --reinstall network-manager, but this only works if the package is still in your Apt cache (
/var/cache/apt/archives/). I'm guessing you haven't so you'll have to do things the long way, but I thought I'd throw that in just in case.
Boot a Ubuntu live CD in "Try without installing". Make sure you are connected to the internet.
In terminal type:
sudo mount --bind /dev /<chrootlocation>/dev sudo mount --bind /proc /<chrootlocation>/proc sudo mount --bind /sys /<chrootlocation>/sys sudo cp /etc/resolv.conf /<chrootlocation>/etc/resolv.conf sudo chroot /<chrootlocation>
You will need to replace
<chrootlocation>with the appropriate location of your Ubuntu install, typically the label of the partition it's installed on. The partition must also be mounted so that you can access it.
/etc/resolve.confand add at least one
nameserver 126.96.36.199 # Google Public DNS
In terminal type:
sudo apt-get update sudo apt-get install network-manager
If you don't you'll likely get an unable to connect error.
In terminal type
exit. This exits you from the chroot environment.
In terminal type
sudo rebootto reboot your computer.
sudo apt-get remove --purge network-manager
The above command will purge all the packages that was related to the service
network-manager.You can download all packages as .deb file using a Ubuntu Live disk and then install it to your original OS.
First boot from a Ubuntu Live disk.
Once you go there open a terminal and run the below command,
sudo apt-get download network-manager*
This will download all the network-manager packages to the home directory.
Now copy all the
.debpackages to a folder in that pen drive or other partitions in your HDD and then reboot to your system.
Once you go there open terminal and do the following:
cd /path/to/the/directory/where/.deb/files/are/located sudo dpkg -i *.deb
The above command will install all the
Now restart your network-manager by running
sudo service network-manager restart
Now you have the package
network-manager-gnome running again.
This answer assumes that you had internet access before losing network-manager or any other packages.
Create a bootable Ubuntu CD/DVD or USB stick, boot from it and select "Try Ubuntu without installing". Once you get to the Ubuntu desktop, open a terminal.
You need to find out your root partition on your Ubuntu installation. On a standard Ubuntu installation, the root partition is "/dev/sda1", but it may be different for you. To figure out what's the root partition, run the following command:
sudo fdisk -l
This will display a list of hard disks and partitions from which you'll have to figure out which one is the root partition. Below in step 3, ROOT-PARTITION is the root partition you just found, for example /dev/sda2 in my case.
Chroot Into Your Root Partition
To make sure a certain partition is the root partition, you can mount it. So let's mount the root partition along with the /sys, /proc, /run and /dev partitions and enter chroot:
sudo mount ROOT-PARTITION /mnt for i in /sys /proc /run /dev /dev/pts; do sudo mount --bind "$i" "/mnt$i"; done sudo cp /etc/resolv.conf /mnt/etc/ sudo chroot /mnt
If you get an error about resolv.conf being identical when copying it, just ignore it. Copying resolv.conf gets the network working, at least for me (using DHCP).
Now you can update the system - in the same terminal, type:
apt-get update apt-get upgrade apt-get install network-manager network-manager-gnome
If you have problems on the last step, make sure your sources are correct in /etc/apt/sources.list - in the same terminal, type:
sudo nano /etc/apt/sources.list
Since you've chrooted into your Ubuntu installation, the changes you make affect it and not the Live CD, as long as all changes are made in the same terminal session.
Reboot when finished and remove the Live CD. If this answer fixes your problem, please mark it correct. Thanks!
Follow official Ubuntu communuty LiveCdRecovery Update Failure section: (https://help.ubuntu.com/community/LiveCdRecovery):
- Boot the Ubuntu Live CD.
- Press Ctrl-Alt-F1
sudo mount /dev/sda1 /mnt sudo mount --bind /dev /mnt/dev sudo mount --bind /proc /mnt/proc sudo mount --bind /sys /mnt/sys sudo chroot /mnt
Add OpenDNS name servers to your
/etc/resolv.confto access the network after chroot:
nameserver 188.8.131.52 nameserver 184.108.40.206
apt-get install network-manager
This helped to fix the same issue on my Ubunty 14.04LTS
I know I'm a little late on this but I just ran into this same problem. I installed arping (sudo apt-get install arping) which removed iputils-arping, network-manager, and network-manager-gnome. I edited the /etc/network/interface file to setup a manual IP for eth0.
# interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback # below are my changes auto eth0 iface eth0 inet static address x.x.x.x gateway y.y.y.y netmask z.z.z.z network a.a.a.a broadcast b.b.b.b dns-nameserver c.c.c.c d.d.d.d
Change x, y, z, a, c, and d to your network settings. I then ran "sudo service network-interface restart INTERFACE=eth0" to restart the interface. This allowed my to reinstall network manager (sudo apt-get install network-manager). I had to purge the arping package I installed before network manager would reinstall. Then start network manager (sudo service network-manager start). Once I had network manager running I changed /etc/network/interface back to default (and kept a copy of the manual change just in case). Hopefully this helps.
Just solved this same problem, follow these simple steps:
Download network-manager in a device having internet connection from http://security.ubuntu.com/ubuntu/pool/main/n/network-manager/
I used network-manager_1.2.2-0ubuntu0.16.04.4_amd64.deb for ubuntu16.04
Then transfer this file using USB or phone etc.
$ sudo dpkg -i network-manager_1.2.2-0ubuntu0.16.04.4_amd64.deb
It may happen that the wifi shortcut might be missing on the top, for that just use this command
sudo apt-get install ubuntu-desktop and then a normal restart of your machine.
My previous answer assumes that the reason you cannot access the internet is because you uninstalled "network-manager", and that normally the computer is connnected to the internet. However on the off chance that I read your question wrong, and this is in fact a computer that isn't ever connected to the internet you will need to use this answer instead though it will be more time consuming.
Step #1 = On another computer (It can be running Windows, doesn't matter), go to "http://packages.ubuntu.com/precise/network-manager". (This link assumes you are using Ubuntu 12.04, if not you will need to find the link appropriate to your version).
Step #2 = At the bottom of the web page there is a link for "amd64" and "i386", click on the approriate one. I'm using amd64 so my steps will assume that.
Step #3 = On the new page there are a bunch of mirror links that are direct download links for "network-manager_0.9.4.0-0ubuntu3_amd64.deb". Pick a link, and download the .deb file.
Step #4 = On the first url I provided it also lists the dependencies for network-manager. You may have some of these still installed, but for the ones you don't you will need to download them as well by visiting their page and selecting a mirror.
Step #5 = Once you've downloaded all the .debs you will be needing transfer them to the Ubuntu computer and put them in "/var/cache/apt/archives". You will need root privileges to do this which can be achieved with "gksu nautilus /var/cache/apt/archives". You could also use dpkg to install them, but it won't tell if you've forgetten a dependency so I'm not going to get into how to use that.
Step #6 = In terminal type "sudo apt-get install --reinstall network-manager".
A newbies successful answer 16.04LTS Was having trouble with network manager slowing/disconnecting with new internet provider Rashly, decided to switch back to wicd and removed network manager via command line Found couldn't get wicd working (stupidly wasn't finding any networks anyway)
Solution First downloaded appropriate network manager deb file on another computer (32bit/i386 for me)(mine was network-manager_1.2.2-OubuntuO,16.04.4_i386.deb) moved file across to ubuntu system laptop using memory card
took time to find out the following - simply double clicked on transferred deb file (on my desktop) and it installed itself (had major problems using the command line)
internet now connected - but not perfect - no icon
so I updated using command: sudo apt-get update Then install NetworkManager: sudo apt-get install network-manager-gnome network-manager
Once rebooted, t his appears to have given me back my icon and full network manager operation
Hope this is helpful for you as it was for me step 1 - get the correct networ-manager deb file from packages website (mine was network-manager_1.2.2-OubuntuO,16.04.4_i386.deb) move it to you ubuntu computer - double click it and install step 2 update and (re)install network manager via command line/terminal, and get missing parts, problems and updates sorted. good luck
I also needed to install network-manager without the internet. I got the idea from another post to add the cdrom: [Ubuntu install DVD/CD] to the software sources in Software and Updates on the 'Other Software' tab. The cdrom source was already listed but not checked so I checked it. Then I used Synaptic Package Manager to install 'network-manager'. I guess I could have used Ubuntu Software instead. This worked for me in Ubuntu 18.10
For me, it turned out that I accidentally deleted
/etc/resolv.conf and then got the same symptoms (
nslookup nba.com doesn't work, but
nslookup nba.com 220.127.116.11 does work, when
18.104.22.168 was configured as my DNS server).
Restoring the file from a live USB solved the issue.
Manually configure your ethernet card in /etc/network/interfaces and restart the networking service. Then apt-get update.