Ex arch btw user here. I noped out and wiped after thinking I had it all nailed down, then I tried to connect my Bluetooth headphones and I came to a grand awakening. I am too old for this shit.
I mean… I would consider anywhere that you might download software from sensitive. This isn’t really a smart move. And sure, the mirror’s page they link to uses https, but if the regular site doesn’t a man-in-the-middle could change the url and serve an official looking malicious version… I wouldn’t consider putting your users at an elevated risk when it’s relatively easy to set up TLS “a smart move”.
If it hasn’t I would just assume that Slackware isn’t a big enough target and that anybody in the position to man-in-the-middle a large number of people would have better targets. I mean, to be clear TLS is not a silver bullet either, but it goes a long way for ensuring the integrity of the data you receive over the internet in addition to hiding the contents.
Distros usually sign their ISOs with PGP as well (Slackware does this), so it’s a good idea to verify those signatures as it’s a second channel that you can use to double check the validity of the ISO (but I’m not sure many people actually do this). Of course, anybody can make PGP keys so you have to find out which key is actually supposed to be signing the iso, otherwise an attacker can just make a bogus key and tell you that that’s the Slackware signing key (on the official website too, because it doesn’t use tls!). The web of trust arguably helps some (though this can be faked as well unless you actually participate in key signing parties or something), and you can hope that the Slackware public key is mirrored in several places that you trust so you can compare them… but at the end of the day for most people all trust in the distribution comes from the domain name, and if you don’t have TLS certificates you’re kind of setting up a weak foundation of trust… Maybe it will be fine because you’re not a big enough target for somebody to bother, but in this day and age it’s pretty much trivial to set up TLS certificates and that gets you a far better foundation… why take the risk? Why is it smart to unnecessarily expose your users to more risk than necessary?
I just installed Nextcloud on Arch and the official packages caused the most headaches I ever had within my 3 years of arch. In contrast I installed the official Jellyfin and Prometheus Server packages and they ran OOTB.
I ended up with not using the official packages but extracting the tar.bz2 into /var/www/nextcloud and slightly modifying the nginx config from their site. I had to move the inclusion of the MIME-Types file to a different block for nextcloud to deliver its CSS, SVGs and images. It wasn't exactly straight-forward too considering permissions. I found it a beast compared to many other server software.
Its probably just one package. I guess for example pacman -S plasma-desktop plasma-meta flatpak fish plasma-wayland-session sddm sddm-kcm && systemctl enable --now sddm does the trick.
Archinstall with the entire plasma desktop is probably also nice, or just EndeavorOS which will be preconfigured
I actually did the whole KDE shebang with archinstall. I never really expected that Arch btw deigned it too opinionated to just provide an audio and Bluetooth interface. Instead I have to choose between pulse audio and pipewire and bluez and a bunch of others. I just didn’t have the patience nor time to look into what and why these options are presented, and this was after I already wasted days figuring how to get my pc to boot with my 12th gen Intel and Nvidia gpu combination.
Turns out there’s a bunch of kernel finagling you absolutely have to do first before it even decides to boot from the gpu and not the igpu. Oh well.