NM won't be able to auto connect because it won't be auto started. Debian have removed the init script for that package.

If the OP has /etc/network/interfaces configured correctly for eth0 then NM is just useless bloat anyway.

And once more for the OP:

Other logs are available :-)

How do you do that, exactly? Please post the exact command(s) used.

NetworkManager should ignore anything listed in /etc/network/interfaces anyway so you should be able to connect fine without it.

However the sid/ceres network-manager package doesn't supply an init script any more so it won't start automatically. Yay. See my thread in the "Freedom Hacks" [sic] section for a guide to generating and using a new init script.

For a simple beep try

printf '\a'

There's also aplay(1) & speaker-test(1) from the alsa-utils package for music files and random noise, respectively.

I presume you mean Devuan ceres? The Debian sid repository should not be mixed with Devuan unless you know what you're doing.

Copy the init script in this post to /etc/init.d/alsa-restore then run

# update-rc.d alsa-restore defaults

Ghost Stories of an Antiquary by M R James. The collection includes The Mezzotint and "Oh, whistle, and I’ll come to you, my lad", both of which were recent BBC productions. I had the pleasure of transporting a freaky doll's head (in clear plastic wrapping, no less) for the latter film. Scary.

The package doesn't supply an init script but it seems to work if stubby is run manually so see https://dev1galaxy.org/viewtopic.php?id=4865 for a way to generate and enable an init script from /lib/systemd/system/stubby.service using sysd2v.sh.

Check the logs to see if any packages were removed for that operation. I've had both GNOME & Xfce working under Devuan chimaera so it should be possible.

This should re-install the full Xfce desktop:

# apt install task-xfce-desktop

Try

# apt install keyboard-configuration console-setup
# dpkg-reconfigure keyboard-configuration
# service keyboard-setup restart

Reference: https://wiki.debian.org/Keyboard

I can only guess that amprolla was delayed but has now caught up ¯\_(ツ)_/¯

Debian bullseye again, this time with openbox:

It has runit as the service manager & runit-init as PID1; systemd is not installed :-)

It should be fine connecting the receiver line out ("pre out") to the valve amp line in ("aux"), just be careful with the volume setting on the receiver. They're both line level, which should be limited to a maximum of 2 volts (the CD standard).

Valve pre-amps tend to swing more volts than transistor pre-amp stages which might be a bit more risky so if you try the mono subwoofer output keep the volume on the valve pre-amp low at first.

Just don't try to connect the speaker outputs to a line level input

You could connect the receiver "pre out" to the valve amp "aux" phono input actually. Then connect the valve amp outputs to the (stereo) speakers.

All that lovely second harmonic valve distortion might actually make the receiver sound better but the signal would go through two pre-amp stages (plus wire and connectors), which isn't ideal.