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Questions tagged [networking]

Managing and using network connectivity on a Ubuntu system

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livepatch apparmor=“DENIED”?

I've just installed canonical-livepatch on Ubuntu Server 16.04.6 LTS and when I try to register the machine I get this on the enable command: 2019/10/20 11:33:55 error executing enable: cannot enable ...
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How could I limit commands on an Ubuntu user?

For example: I want a user to only run a su. Some people tell me to try editing sudoers, chroot o rbash, but I don't know how. How can I do it?
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Error: apt.conf:3: Extra junk at the end of file

I am a beginner user of Ubuntu 18.04. And I want to use a proxy server on my laptop. So I just tried to find a way of using a proxy server to connect to the internet and followed the instructions ...
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Can I respond to a dialogue box via terminal? Or start up screen share from terminal?

I can ssh into computer B from computer A, but when I want to share a screen it asks computer B for permission. Is there a way to respond to that dialogue box from an ssh in terminal? The computer ...
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Why does libreoffice soffice.bin process CONSTANTLY RECEIVE internet bandwidth ? Malware ? Virus ? What?

Why does libreoffice soffice.bin process CONSTANTLY RECEIVE internet traffic ? This is according to BOTH NetHogs and Gnome System Monitor. I was curious about KB/sec internet IO numbers that ...
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ndiswrapper ERROR for ubuntu19.10 wireless driver

I installed ndiswrapper instead of broadcom43142 driver because I have in blacklist on modprobe bc43 and other broadcom files Nevertheless, I still have problems. When I put in terminal sudo ...
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Ubuntu not recognizing Archer T4U US 3.0 properly

I recently formatted my computer and bought a wireless adapter for it Archer T4U US 3.0 from tp link. I have been trying to get it to work but at first it did not recognize the wifi adapter, so I ...
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How do i disable/remove Windows Network and BRCM/LVG ,I don't want any shared/other networks

i noticed on filemanager/ other locations i have two folders that i have no permission to delete/remove/disable. Windows Network and BRCM/LVG. I understand i may use sudo -i root commands but i been ...
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Where are network settings configured in my 18.04 distribution?

I am a bit confused as to where my network settings are configured. I am using 18.04, and /etc/network/interfaces says: # ifupdown has been replaced by netplan(5) on this system. See # /etc/netplan ...
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Configure Machine as both Web Server and Router

Let me preface by saying I have very little experience on the networking side of things. Context: I have a machine running Ubuntu 18.04 LTS (bionic-dev) that hosts a web page on port 8050. This ...
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How to check if a port is blocked by my ISP?

My little backstory here is that I am trying to connect via ssh to a postgres remote database set up by heroku, --> Connecting to postgresql-slippery-32494 psql: could not connect to server: No ...
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Wifi-Disabled: Ubuntu 19.10 - Intel Wireless 7265

After updating to Ubuntu 19.10: Clicking Continue using.. get resetted back to Do not use... Tried to download drivers from the Microsoft website and put them into lib/firmware. The WiFi works ...
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Installing driver requires me to “make clean” but no rule to make target 'clean'

Step 2.2 says to run the commands make followed by make clean but nothing happens make: No targets found and no makefile found make clean: No rule to make target 'clean' Output of ls /lib/modules/...
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Use VPN connection for one network interface only (OpenVPN/NordVPN)

I am setting up a new server using ubuntu server 18.04. It as two physical network interfaces (enp0s3 and enp0s8) and a virtual one created by NordVPN using the OpenVPN protocol (tun0). Since I have ...
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Network connection failed

This is a new install, wired to the network. The system keeping trying to connect and fails. I'm not sure why since the network is up and running.
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Removing netplan in 18.04

I looked at questions 1031709 ubuntu-18-04-switch-back-to-etc-network-interfaces Now can someone please make up a decent, reliable, working, and definitive method to remove the netplan non-interface ...
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Reverse SSH tunnel to allow others to use my machine as a jumping station

I'm running ubuntu 18.04. I have a server that I SSH to, but I first need to turn on a VPN for that to work. I want to enable other users to SSH to a port on my machine, in order for them to reach ...
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1answer
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Commandline L2TP connection?

I'm looking to connect to a L2TP VPN server, from ubuntu commandline. Ubuntu 18.04. I've already done it via a desktop ubuntu. By which I mean: added l2tp network manager, configured it and connected ...
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dnsmasq ignoring nameserver

I'm building a private network not connected to the internet with VirtualBox for practice and i'm using dnsmasq on the server machine for both DHCP (and DHCPv6) and DNS service. The DHCP works fine ...
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Computer freezes after local web content is accessed from another device

I use Ubuntu 16.04 in my computer. I run LAMP for development of PHP. Whenever I access the web content from another device (Android browser) using IP address of my computer (192.168.0.104), my ...
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openvpn error outines:SSL_CTX_use_certificate:ca md too weak

On Ubunto 16 I've configured openVPN with password with Certificate (TSL) my config file is: dev tun remote XX.XX.XXX.X ca ca.crt cert user_name.crt key user_name.key ns-cert-type server It does ...
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Can't ping gateway. Randomly switches between working and not working

I connected to a new Wifi network 2 days ago. Worked fine. All of a sudden I had no internet access. I pinged google and got temporary failure in name resolution. I pinged my gateway and got no ...
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Curl, git, other commands hang while trying to download file

Currently on Ubuntu 18.04.12, when I try to download something from the terminal, or push to git or any similar command it always hangs on the download either indefinitely or for a very long time. ...
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Ubuntu Server 18.04 LTS - Unable to change IPv4 settings duing setup

During setup on Ubuntu Server 18.04 LTS, I have problems setting up manual IPv4. I'm enter the following: Subnet: 255.255.255.0/24 Address: 192.168.0.50 Under address I get the following error: '...
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Wireless network not shown in Elementary OS 5.0 Juno [on hold]

I have recently installed elementary OS 5.0 juno. I could not find any wireless network for accessing internet. Unfortunately I was not able to install wireless driver, moreover I tried almost every ...
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iw dev command read information

I have Ubuntu 18.04 installed on my PC. My machine has WIFI device and able scan near by AP's. My PC regulatory domain is JP, Using iw dev command shows the following information : root@DZB3Q42:~# ...
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systemd-resolved and resolvconf : is it ok to have both installed?

Systemd-resolved is present by default in Ubuntu 18.04. Resolvconf pkg is not. From reading around, systemd-resolved provides name resolution while resolvconf provides multi-client access to update ...
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Network don't recognize Printer's Scanner “Ricoh”

I have a "Ricoh Aficio MP 2851" Printer/scanner used on top of a router network. On Windows, it works fine. On Ubuntu 19.04: The printer is found automatically. The scanner doesn't appear on the ...
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Can't reach interface after adding second one

I have the following scenario: CLIENT (itf1: 192.168.2.2) SERVER (itf1: 192.168.1.254 (with GW), itf2: 192.168.2.254) Since I added the itf2 to the SERVER I can't ping itf1 from the CLIENT. Ping ...
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how to change public IP address

I'm having issue with my ubuntu + virtualmin. I'm getting blocked from YouTube for getting information. And want to change my public IP address. I've tried with Dedicated IP in virtualmin and by ...
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change dhcp server range and ip to new values

i'm using ubuntu 18.04 on a raspberry pi. and share my wifi through the lan using network manager (share to other computers), when i connect my laptop to a lan this works perfect and browse internet, ...
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Hosting an Ubuntu server used shared network from Windows PC

I have successfully setup my Ubuntu server using the network from my Windows PC. Currently, this is how I have it set up: Router connected wirelessly to Windows PC Windows PC sharing network via ...
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Ethernet blocked after a while, have to rfkill unblock all

Ubuntu 18.04, Wireless disabled After about 15 minutes of running, suddenly I don't have internet access anymore. The only solution that works is doing sudo rfkill unblock all and then sudo dhclient....
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Wireless Woes: iwlwifi-8265 - Ubuntu 18.04 (and Mint Tara)

I am trying to set up two machines, both have identical hardware that should be supported by the newer Linux kernels. The wireless card inside is a GIGABYTE "GC-WB867D-I" Wifi+Bluetooth. Out of the ...
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How to find fastest mirror link during every installation

This is the problem: sometimes I connected to internet via VPN (this VPN server could be in countries like USA, UK and etc) sometimes I connected to internet without VPN. When I connected to internet ...
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Wifi internet connection keeps dropping. Need to restart NetworkManager always to work

I have a problem with my WiFi internet connection. It keeps dropping even-though I'm still connected to the network. The thing I did always when it occurs is to type this command: sudo systemctl ...
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25 views

Samba Winbindd Failing Everyday

Everyday morning on my domain controller running samba 4.7.6-ubuntu winbind fails, If I try to run the command wbinfo -u (to list all users) I get an error (I will add the error when It happens) ...
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1answer
41 views

Ubuntu server 19.04 internet connection problem

I have already installed Ubuntu server. I plugged in ethernet cabel and i have not got internet connection. After run ifconfig result is: lo: flags=73<IP,LOOPBACK,RUNNING> mtu 65536 inet 127.0....
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Ubuntu 18.04 not working with Panda Wireless PAU09 on USB 3.0

Recently received a Panda Wireless PAU09. It works fine on any of the computer's USB 2.0 ports, but not USB 3.0 ports. USB 3.0 ports are functional, as they can connect to other USB devices. lsusb ...
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1answer
47 views

Not able to connect to internet when both ethernet and wifi is connected in Ubuntu 16.04

I have Ubuntu 16.04 (machine 1) and Windows 10 (machine2). I have connected the ubuntu to the wifi with IP 192.168.0.110 and I can browse internet easily. I have to do remote C++ development on ...
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How to redirect a port range on a load balancer

I'm a little new to this and trying to figure this out. I have 3 web servers running Ubuntu 16.04 and Apache2. One of the web servers will serve as a load balancer for the other two. I have the load ...
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2answers
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WiFi disables after suspending

newbie Ubuntu MATE user here. First off, I know this is a well documented issue, i've tried multiple solutions from various sites and none of them worked. I'm running Ubuntu 18.04.3, and whenever i ...
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18.04 Causing network Flood

I have a fresh install of Ubuntu 18.04, however without out doing anything the machine becomes the loudest talker on the network and causes a network flood. Any suggestions would be appreciated? What ...
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1answer
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How do I make my server accessible from any network?

I am trying to get my server accessible from anywhere online. I have already installed and configured noip, but it seems it cannot connect at all. I have a Linksys WRT1900 router, is there anything I ...
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19.04 just installed … where is Wifi?

HP Pavilion dv9700. (10-year-old laptop.) Bad video on monitor (but good video on external monitor). Wondered what would happen with Lubuntu. (Answer: good video on laptop monitor!) No Wifi. No ...
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Running Ubuntu 18.04 -bionic-beaver Netplan config not working or being applied

Ruunog Ubuntu 18.04 wiht Netplan and bionic-baaver so it seems. When I configured the OS I have to configure it using DHCP SO once up, I wish to change networking so I configure the .YAML file under ...
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27 views

Telnet connection refused [on hold]

I have a server on Ubuntu 14.04 listening on port 8443. curl GET https://localhost:8443 --insecure works fine, same for wget with --no-check-certificate. However if I try to connect to the server ...
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netplan and bond definition

How to change below in to a netplan yaml file for Ubuntu18.04 ? root@ubuntu-sio1-cpa117-2:/etc/network# cat interfaces # This file describes the network interfaces available on your system # and how ...
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1answer
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SSID not on list

I've updated my Ubuntu Mate to V16.04 with RJ45 cable, now I want to connect back my PI3 over my Wifi network but my SSID is not on the list .... Any idea ? I try many times to restart the network ...
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1answer
57 views

How to lock network settings and desktop wallpaper for non-sudo users

Question solved: I ended up using dconf since Ubuntu Desktop natively uses the GNOME desktop. For any people unfamiliar with it, you can edit dconf settings via terminal or GUI. I ended up doing it ...