I take it you've visited the LTSP pages?

https://ltsp.org/

About 15 yrs ago I managed to set up an LTSP server and to boot a client from it. Don't fool yourself, it's quite a job to set up the entire infrastructure: DHCP, FTP, DNS and only then LTSP as such. Effectively, you're setting up a very localized but complete mini-ISP. It can be done, I did, but it's worth getting pretty comfy on the CLI, cause you'll use it a lot. It also requires, due to DNS and DHCP, a physically separate network. Technically you might be able to get stuff working on your existing network, but only if you have unrestricted access to the router of your home network. Basically, you need to know what you're doing and if you do, you didn't have to ask

There might be something else going on you probably don't realize. Do the following:

su #become root, alternatively sudo su
fsck /media/<user>/<UUID> #check the file system for errors and repair if required
chown <user> /media/<user>/<UUID> #make sure the directory is owned by the user
chmod 777 /media/<user>/<UUID> #set permissions for the directory for general access

HTH!

There are more packages providing this functionality besides the pair you mentioned. You can find them with apt-search.

man apt

This is the line you need to add to /etc/fstab:

UUID=uuid-string-goes-here   /path/to/directory fs-type defaults 0 0

You're advised to mount the SSD in /media, but being Linux, you're free to mount it anywhere in the tree you'd like The fs-type is what you've used to format the drive in. If you formatted with ext4, just substitute ext4 instead of fs-type.

Assuming you mount the drive in /media/fast-storage, you'd need to set access rights to that directory to allow you access w/o any passwords at all:

chown <user>,<group> /media/fast-storage #as root

In this <user> is your user name and <group> is the name of the group your user is a member of (on Devuan, usually user- and group names are the same).
For instance, say your username is rank, the command would look like:

chown rank,rank /media/fast-storage

There's more to it, but this'll get you started

OK, I found an answer. Bit of a dirty work-around, but the errors are gone now.

As root, open /var/lib/dpkg/status in nano (or editor of choice) then search for the ipmitool package listing. The 2nd line reports its status, change this to

Status: purge ok config-files

Reload sources.list in your package manager then update your system. If all is well, no more errors!

As said, a dirty work-around as it doesn't address the issue of how that package got into that state in the first place and it's likely remnants of this packages remain on my system.

Well, TPlink was right, you need a router. Or at least a device that does NAT and DHCP. Your ISP reserves exactly 1 (one) IP address for your connection. You want to connect more then one device, so you need to share that IP address within your local network. That's what NAT (network address translation) stands for and DHCP actually does.

Suitable devices aplenty, here's a small selection in various price ranges:

Ubiquiti EdgeRouter X

MikroTik hEX S router

Ubiquiti EdgeRouter 6P

Various FritzBox router models, including those for direct Fibre connection.

Some models have WiFi, but you can switch that off, as I do too.

This is why having separate partitions for stuff like /var, /usr and /tmp are advised. Certainly I do adhere to this

Your Downloads folder is huge and the key reason why your / has filled up. I take it you downloaded a lot so clearing that one out will release a decent amount of storage.

I'm using Mate and have Shotwell running just fine.

root@desktop:/home/<user># apt show shotwell
Package: shotwell
Version: 0.30.11-1
Priority: optional
Section: gnome
Maintainer: Jörg Frings-Fürst <debian@jff.email>
Installed-Size: 6,606 kB
Depends: libc6 (>= 2.29), libcairo-gobject2 (>= 1.10.0), libcairo2 (>= 1.2.4), libexif12 (>= 0.6.21-1~),
 libgcr-base-3-1 (>= 3.8.0), libgcr-ui-3-1 (>= 3.8.0), libgdata22 (>= 0.15.0), libgdk-pixbuf-2.0-0 (>= 2.25.2),
 libgee-0.8-2 (>= 0.10.1), libgexiv2-2 (>= 0.10.4), libglib2.0-0 (>= 2.49.5), libgphoto2-6 (>= 2.5.10),
 libgphoto2-port12 (>= 2.5.10), libgstreamer-plugins-base1.0-0 (>= 1.0.0), libgstreamer1.0-0 (>= 1.0.0), libgtk-3-0 (>= 3.21.5),
 libgudev-1.0-0 (>= 146), libjson-glib-1.0-0 (>= 1.5.2), libpango-1.0-0 (>= 1.18.0), libpangocairo-1.0-0 (>= 1.14.0), libraw20 (>= 0.16.0),
 libsoup2.4-1 (>= 2.41.90), libsqlite3-0 (>= 3.5.9), libwebkit2gtk-4.0-37 (>= 2.25.1), libxml2 (>= 2.7.4), shotwell-common (= 0.30.11-1),
 dconf-cli, default-dbus-session-bus | dbus-session-bus, librsvg2-common
Replaces: shotwell-common (<< 0.26.2-1)
<snip>
Download-Size: 1,826 kB
APT-Manual-Installed: yes
APT-Sources: http://pkgmaster.devuan.org/merged stable/main amd64 Packages

I'm not sure I upgraded to the latest stable release yet, so I might still be on Old-Stable.

HTH!

Is CUPS actually running?

As root, do:

sh /etc/init.d/cups start

Then try connecting to localhost:631 again.

Install aptitude, which is a basic package manager. Then, as root, type aptitude on the cli to start the tool. Search the package pool with ?. The easiest way for obtaining a full desktop is via the task-* packages alluded to earlier. There are several, including but not limited to:

task-gnome-desktop
task-mate-desktop
task-kde-desktop
task-cinnamon-desktop
task-xfce-desktop

These are so-called meta-packages: they don't contain software but using the dependency system apt provides they pull in all the required packages you need for a functional desktop. Select one or more and let the system finish. Reboot and your desktop should start.

Having said that, you don't need aptitude to install those desktop meta packages. If you've made your choice already, install directly via apt:

apt-get install task-cinnamon-desktop

Replace cinnamon with your DE of choice

HTH!

Quick note to inform those interested LMG has their channels back. Source of the issue was a "prepped" PDF opened by an unsuspecting team member who happened to have some session cookies the scammers were able to steal and exploit.

LTT video explaining more:
https://www.youtube.com/watch?v=yGXaAWbzl5A

HTH!