Hi!

I'm running Discover on top of Arch Linux.

After installing Deluge using Discover and trying to start Deluge (with Discover's play button), an error message popped up saying "Cannot launch Deluge".
I entered "deluge" in Konsole but saw only "run deluge" and "Get Deluge...", indicating that Deluge wasn't properly installed.

In Konsole, calling deluge resulted in this message:

deluge: error: argument {console,web} [UI args]: invalid choice: 'gtk' (choose from 'console', 'web')

I solved this by installing the Deluge's GTK GUI using

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pacman -S deluge-gtk

Is this an oversight in Discover?

Sounds more like a packaging error from the distro, unsolved dependencies is not something Discover can be blamed for

Package deluge provides a TUI and web interface for Deluge.
Package deluge-gtk provides a GUI for Deluge.

I'm pretty certain that when installing Deluge from Discover, people expect to get the latter, not the former.
Especially since starting Deluge with KRunner only works that way.

Again, this is packaging and dependencies, these need to be done correctly by the packagers, Discover will only provide what the distro provides.

In Discover, when I search for "Deluge", and click the "Install" button on the only search result returned, how does Discover pick the package to install?
Does PackageKit choose to do the equivalent of pacman -Sy deluge instead of pacman -Sy deluge-gtk?

Well, when I search for deluge I find two packages in Discover, on is the GTK client. If you find only one then something is wrong in the packaging, talk to your distro.

I was wondering: why don't you just use KTorrent if you are using Plasma anyway?

talk to your distro

I set this system up with

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pacstrap /mnt base linux linux-firmware grub plasma vi vim sudo networkmanager packagekit-qt5

from an Arch Linux live image. I don't think the concept of "distro" applies in this case. I could ask on the Arch Linux Forums but I assume they'd tell me it's Discover who chooses the package deluge over deluge-gtk, making this the relevant forum.

why don't you just use KTorrent

I'm setting up Plasma and applications for a friend and they prefer Deluge.

The Arch Linux Forums is exactly what Mamarok is meaning by ask your distro. The base system is the Arch Linux distribution of linux; Arch Linux is what provides the packaging support (unless you created your own custom from-scratch linux distribution using its own packaging system).