David Niklas via Dng <dng@???> writes:
> Hello,
> I just installed Devuan Daedalus. It connected to the net just fine, but
> after installing a bunch of packages (too many to count), I rebooted the
> system and the network is not brought up correctly.

[...]

> I run bootlogd, so I examined the network startup:
> Thu Jul 3 XX:XX:XX 2025: Mounting local filesystems...done.
> Thu Jul 3 XX:XX:XX 2025: Activating swapfile swap, if any...done.
> Thu Jul 3 XX:XX:XX 2025: Cleaning up temporary files....
> Thu Jul 3 XX:XX:XX 2025: Starting Setting kernel variables: sysctl.
> Thu Jul 3 XX:XX:XX 2025: Configuring network interfaces...error: eth0 :
> eth0: up cmd '/etc/network/if-up.d/avahi-autoipd' failed: returned 2
> (Error: Device for nexthop is not up.

Your system has been infected by Poetterware. The likely solution is to
create a file /etc/apt/apt.conf.d/01norec with the following content:

APT::Install-Recommends "0";

and purge anything-avahi afterwards (ie, any package with avahi in the
name). The apt.conf.d file while prevent it from being reinstalled just
because some package maintainer chose to list it as "recommended other
software".