I've just installed Ubuntu 18.04 and selected "minimal install". I then tried to run
ifconfig in the terminal and got the following message
-bash: ifconfig: command not found
How come the
net-tools package is not installed by default any more?
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ifconfig is deprecated, and has been so for quite a number of years. The new kid in town is the
ip command, which can configure IP's, routes, and everything associated with networks.
You can install
sudo apt install net-tools, if you absolutely need to have it. If not, start learning
In short, it is removed because you should not use it. It has mediocre IPv6 support, the
ip command is a better replacement. I find sources saying ifconfig was deprecated back in 2012, so I'm not surprised it's finally removed.
You may be able to install it on 18.04, but on future releases it may disappear entirely. I would consider it not being installed by default as a warning shot: learn
ifconfig is probably in a special class. In previous versions of Ubuntu it was included in minimal installs. It is now being phased out, and you explicitly have to install it. This can not be taken to indicate that any other packages are missing.