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aggsol
Asked: 2019-11-15 02:32:08 +0800 CST

How to disable WiFi and Ethernet at login?

  • 772

No matter what was the state during the last session. I want Wifi and Ethernet to be disabled to actively connect to the outside every time. I want to prevent every auto connect to a network.

Solutions should work with GNOME desktop and/or Pantheon desktop

Using Ubuntu 18.04

gnome wireless ethernet pantheon

2 Answers

  1. You coud add a @reboot cron task to run a script that will set all the interfaces down:

    1. sudo crontab -e

    2. add this line:

      @reboot /path/to/script

    The script:

    #!/bin/bash

for interface in `ip link | awk 'FNR%2 == 1 {print substr($2, 1, length($2)-1)}'`; do
    ip link set $interface down
done
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  2. Best Answer

    Unticking a "connect automatically" will add "autoconnect=false" under the "[connection]" block of the said connection in /etc/NetworkManager/system-connections. One thing is therefore just running a little script to add this line to all known connections if it is not there, yet:

    #!/bin/bash
for f in /etc/NetworkManager/system-connections/*
do
  if [[ -f "${f}" && "$(grep 'autoconnect=false' "${f}")" == "" ]]
  then
    sed -e '/^\[connection\]$/aautoconnect=false' -e '/^\[connection\]$/q' -i "${f}"
  fi
done

    Notably you want it to run before a network connection occurs and also after waking from suspending/hibernating. A systemd-service disable-autoconnect.service will do:

    [Unit]
Description="Service to disable all autoconnections"
Before=network.target
After=sleep.target

[Service]
ExecStart=/path/to/above/script.sh
Type=oneshot

[Install]
WantedBy=sleep.target default.target
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