[Software] Switch to newtwork manager as default

[karcio]

Hi, just new install of Debian 12

During installation I setup wifi and now I want to have network managed by NM. So I am trying o follow wiki
https://wiki.debian.org/NetworkManager# ... Management

but when I run nmtui - I can not see any network. To see networks I need do following:

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sudo systemctl stop networking.service 
sudo systemctl restart NetworkManager
sudo nmtui

but after reboot command

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sudo nmtui

does not show any network

Of course Network Manager is enabled. So I am thinking I need to disable some service which override NM.

[mrmazda]

I bear no resemblance to an expert on networking, with absolutely none related to any part of NetworkManager other than removing it, but I have considerable experience in switching from traditional Debian ifupdown networking to systemd-network, dating back to Buster. Part of that is using

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systemctl list-unit-files | grep net

to see what is enabled or not, and using that as a guide to determine what to disable or remove. Other particulars I don't remember, but ifupdown and/or networking.service are either not enabled, or not installed. On the Bookworm booted now I have:

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# inxi -S
System:
  Host: ara88 Kernel: 6.1.0-30-amd64 arch: x86_64 bits: 64
  Desktop: TDE (Trinity) v: R14.1.3 Distro: Debian GNU/Linux 12 (bookworm)
# dpkg-query -W | egrep 'netw|ifup|systemd'
libpam-systemd:amd64    252.33-1~deb12u1
libsystemd-shared:amd64 252.33-1~deb12u1
libsystemd0:amd64       252.33-1~deb12u1
systemd 252.33-1~deb12u1
systemd-sysv    252.33-1~deb12u1
systemd-timesyncd       252.33-1~deb12u1
# systemctl list-unit-files | egrep 'net|ifup'
dbus-org.freedesktop.network1.service  alias           -
inetutils-inetd.service                generated       -
systemd-network-generator.service      disabled        enabled
systemd-networkd-wait-online.service   masked          disabled
systemd-networkd-wait-online@.service  disabled        enabled
systemd-networkd.service               enabled         enabled
systemd-networkd.socket                enabled         enabled
network-online.target                  static          -
network-pre.target                     static          -
network.target                         static          -
#

In newer versions of systemd than Bookworm has, in some distros, systemd-network is a separate package.

[karcio]

This is output after reboot:

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sudo systemctl list-unit-files | grep net 
networking.service                         enabled         enabled
systemd-network-generator.service          disabled        enabled
systemd-networkd-wait-online.service       disabled        disabled
systemd-networkd-wait-online@.service      disabled        enabled
systemd-networkd.service                   disabled        enabled
systemd-networkd.socket                    disabled        enabled
network-online.target                      static          -
network-pre.target                         static          -
network.target                             static          -

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sudo systemctl list-unit-files | egrep 'net|ifup'
ifup@.service                              static          -
ifupdown-pre.service                       static          -
ifupdown-wait-online.service               disabled        enabled
networking.service                         enabled         enabled
systemd-network-generator.service          disabled        enabled
systemd-networkd-wait-online.service       disabled        disabled
systemd-networkd-wait-online@.service      disabled        enabled
systemd-networkd.service                   disabled        enabled
systemd-networkd.socket                    disabled        enabled
network-online.target                      static          -
network-pre.target                         static          -
network.target                             static          -

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sudo dpkg-query -W | egrep 'netw|ifup|systemd'
glib-networking:amd64   2.74.0-4
glib-networking-common  2.74.0-4
glib-networking-services        2.74.0-4
ifupdown        0.8.41
libpam-systemd:amd64    252.33-1~deb12u1
libqt5network5:amd64    5.15.8+dfsg-11+deb12u2
libsystemd-shared:amd64 252.33-1~deb12u1
libsystemd0:amd64       252.33-1~deb12u1
network-manager 1.42.4-1
network-manager-gnome   1.30.0-2
systemd 252.33-1~deb12u1
systemd-sysv    252.33-1~deb12u1

[mrmazda]

Being unfamiliar with how NetworkManager works, it's not obvious to me all that your data is telling us, or not. If it were here, I'd try

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sudo systemctl disable networking.service

reboot, and then try nmtui, just to see if that's all it takes to make NM work. Then I'd remove NM, create systemd-network config(s) for the network device(s) in /etc/systemd/network/, disable or remove resolvconf (if in place), create a static /etc/resolv.conf, and enable systemd-networkd.socket.