Re: NetworkManager "nmcli device" saying eth0 and wlan0 are "unavailable"

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Am 26.04.26 um 14:11 schrieb Subhrajit Sain ([email protected] via
blfs-support Mailing List):
> Hello BLFS Support Team,
> 
> I have been working on this BLFS system called MrrpOS (Book 12.3, SysV). This is my second problem sent via email. Recently I have switched from manual wpa_supplicant and dhcpcd init scripts to NetworkManager (1.50.0), but I am facing some trouble in doing so. The loopback interface lo works (set up externally by an init script) but eth0 and wlan0 are shown as unavailable.

File  /etc/NetworkManager/conf.d/no-dns-update.conf  prevents the update
of /etc/resolv.conf.  Renaming that file to
/etc/NetworkManager/conf.d/no-dns-update.conf.bkp  once solved the
problem with mobile connections for me.

If that doesn't help take a look at section "Debugging" in
"man NetworkManager" for more clues how to isolate the problem.

Rainer



> 
> 
> 
> My device does not have Ethernet plugged in, that maybe the cause for eth0 being unavailable. But, wlan0 is stated as unavailable as well.
> 
> 
> 
> root@mrrpos:[ / ]# ls -n /etc/rc.d/rcS.d 
> 
> total 0
> 
> lrwxrwxrwx 1 0 0 21 Jun 10  2025 S00mountvirtfs -> ../init.d/mountvirtfs
> 
> lrwxrwxrwx 1 0 0 14 Jun 10  2025 S05udev -> ../init.d/udev
> 
> lrwxrwxrwx 1 0 0 17 Jun 10  2025 S10modules -> ../init.d/modules
> 
> lrwxrwxrwx 1 0 0 14 Jun 10  2025 S20swap -> ../init.d/swap
> 
> lrwxrwxrwx 1 0 0 17 Jun 10  2025 S30checkfs -> ../init.d/checkfs
> 
> lrwxrwxrwx 1 0 0 17 Jun 10  2025 S40mountfs -> ../init.d/mountfs
> 
> lrwxrwxrwx 1 0 0 17 Jun 10  2025 S45cleanfs -> ../init.d/cleanfs
> 
> lrwxrwxrwx 1 0 0 20 Jun 10  2025 S50udev_retry -> ../init.d/udev_retry
> 
> lrwxrwxrwx 1 0 0 16 Jun 10  2025 S60sysctl -> ../init.d/sysctl
> 
> lrwxrwxrwx 1 0 0 17 Jun 10  2025 S70console -> ../init.d/console
> 
> lrwxrwxrwx 1 0 0 18 Jun 10  2025 S75localnet -> ../init.d/localnet
> 
> lrwxrwxrwx 1 0 0 21 Apr 26  2026 S80dbus -> /etc/rc.d/init.d/dbus
> 
> lrwxrwxrwx 1 0 0 31 Apr 26  2026 S85networkmanager -> /etc/rc.d/init.d/networkmanager
> 
> root@mrrpos:[ / ]# ls /etc/rc.d/init.d
> 
> checkfs  dbus             gpm       krb5      mountfs      network-ifaces-up  rc           setclock  sysctl    udev
> 
> cleanfs  dhcpcd.disabled  halt      localnet  mountvirtfs  networkmanager     reboot       sshd      sysklogd  udev_retry
> 
> console  fontface         iptables  modules   network.bak  random             sendsignals  swap      template  wpa_supplicant
> 
> root@mrrpos:[ / ]# nmcli device
> DEVICE         TYPE      STATE                   CONNECTION
> lo             loopback  connected (externally)  lo        
> 
> eth0           ethernet  unavailable             --
> wlan0          wifi      unavailable             --        
> ... others are "unmanaged" ...
> 
> 
> Please let me know any file contents, configurations, directory listings and other information required.
> 
> 
> 
> With wpa_supplicant + dhcpcd:
> 
> 
> 
> iwlwifi in dmesg:
> 
> 
> 
> No message for wlan0:
> 
> 
> 
> nmcli device:
> 
> 
> 
> Some device info:
> 
> 
> 
> 
> 
> Some other info:
> 
> The same devices work as usual with wpa_supplicant and dhcpcd via init scripts.
> 
> Probably not a driver issue as both wext and nl80211 are installed.
> 
> I am not using iw, I am using iwconfig.
> 
> Ping obviously gives "network unreachable."
> 
> 
> I maybe missing out on a BLFS step, but it is not clear as to what it is. I am willing to share any information that may help in identifying and fixing this issue.
> 
> 
> 
> Thanking you in advance for your help,
> Subhrajit Sain,
> 
> aka https://anw.is-a.dev .
> 
> 

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