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I am learning Linux, using Ubuntu. I wanted to remove network management from one of the run levels. I had done this correctly before, but now, no matter how hard I try, I can not remove a script from the desired run levels.

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the rc3 folder is empty so how can I work on run level 3?!

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Yes, with version 15.04 Ubuntu switched to systemd. The rcX.d folders are mostly obsolete.

You can use a configuration command like sudo systemctl disable network-manager.service to disable the network manager (which should leave the networking mostly unconfigured).

There are no runlevels in systemd, but an equivalent called "targets". tecmint lists the mapping like this:

  • Run level 0 is matched by poweroff.target.
  • Run level 1 is matched by rescue.target.
  • Run level 3 is emulated by multi-user.target.
  • Run level 5 is emulated by graphical.target.
  • Run level 6 is emulated by reboot.target.

You can switch to a specific target via systemctl isolate multi-user.target. Symlinks usually exist, so you can also enter systemctl isolate runlevel3.target

In order to remove a unit from a particular target, you can modifiy the unit's WantedBy directive. Please be aware that targets can depend on each other, so removing a unit from a target will also remove it from the dependees.

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  • I'm familiar with systemctl, but I mean something else I'm looking for permanent change for runlevels. Commented Aug 17, 2021 at 15:06
  • I extended my answer.
    – Hermann
    Commented Aug 17, 2021 at 16:13

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